#### Section 1 : CH 0 Some preliminaries

 Lecture 1 The prerequisites Introduction 0:53 Lecture 2 How to 'add' numbers 4:16 Lecture 3 How to 'subtract' numbers 3:13 Lecture 4 How to 'multiply' numbers 7:9 Lecture 5 Multiplying by 10, 100, 1000, 5:54 Lecture 6 How to 'divide' numbers 10:15 Lecture 7 The division algorithm 5:20 Lecture 8 Multiple of divisor nearest to the dividend 4:56 Lecture 9 Divisibility tests of numbers 8:39 Lecture 10 How to do 'cancellations' in division 6:35 Lecture 11 The 'VBODMAS' rule 6:27 Lecture 12 Problem session On 'VBODMAS' 10:13

#### Section 2 : CH 1 The Basics Number, Numeral and Numeration

 Lecture 13 'Number' vs 'Numeral' vs 'Numeration' 12:23 Lecture 14 Numbers 7:57 Lecture 15 Numerals 11:55 Lecture 16 Roman Numeral System Introduction 4:9 Lecture 17 Roman Numeral System Rule 1 6:32 Lecture 18 Roman Numeral System Rule 2 4:7 Lecture 19 Roman Numeral System Rule 3 5:40 Lecture 20 Roman Numeral System Rule 4 9:55 Lecture 21 Roman Numeral System All 4 rules 10:46 Lecture 22 Problem session On 4 rules 3:42 Lecture 23 Roman Numeral System - 1 to 1000 14:1 Lecture 24 Roman Numeral System - 1001 to 3999 17:55 Lecture 25 Problem session Hindu-Arabic to Roman 9:40 Lecture 26 Roman Numeral System Roman to Hindu-Arabic 8:50 Lecture 27 Problem session Roman to Hindu-Arabic 20:3 Lecture 28 Roman Numeral System - beyond 3999 16:5 Lecture 29 Roman Numeral System Demerits 6:33 Lecture 30 Hindu-Arabic Numeral System 7:44 Lecture 31 Numeration 4:1 Lecture 32 International system of numeration 18:9 Lecture 33 Problem session International system of numeration 16:51 Lecture 34 Indian system of numeration 16:25 Lecture 35 Problem session Indian system of numeration 19:32 Lecture 36 International numeration and Indian numeration 5:12 Lecture 37 Conversion problems 17:13 Lecture 38 Difference between International numeration and Indian numeration 4:22

#### Section 3 : CH 1 The Basics 'Face value' and 'Place value'

 Lecture 39 Face value and Place value 18:21 Lecture 40 Difference between 'Face value' and 'Place value' 2:32 Lecture 41 Problem session 1 16:7 Lecture 42 Problem session 2 11:23 Lecture 43 Problem session 3 15:8

#### Section 4 : CH 1 The Basics 'Expanded Form' of a Number

 Lecture 44 Expanded form of a number Introduction 5:47 Lecture 45 Problem session Writing expanded form 12:43 Lecture 46 Problem session Writing number from expanded form 5:43

#### Section 5 : CH 1 The Basics Comparing Numbers

 Lecture 47 Comparing 2 numbers Introduction 8:40 Lecture 48 Comparing 2 numbers Rule 1 6:22 Lecture 49 Problem session Rule 1 20:58 Lecture 50 Comparing 2 numbers Rule 2 2:44 Lecture 51 Problem session Rule 2 18:3 Lecture 52 Comparing 2 numbers Rule 3 8:5 Lecture 53 Problem session Rule 3 20:39 Lecture 54 Comparing 2 numbers Rule 4 5:26 Lecture 55 Problem session Rule 4 14:56 Lecture 56 Ascending order (Increasing order) 7:37 Lecture 57 Descending order (Decreasing order) 6:24 Lecture 58 Difference Ascending order vs Descending order 5:31 Lecture 59 Comparing more than 2 numbers Rules 7:29 Lecture 60 Comparing more than 2 numbers Example 1 9:4 Lecture 61 Comparing more than 2 numbers Example 2 17:4 Lecture 62 Comparing more than 2 numbers Example 3 11:55 Lecture 63 Problem session Ascending order and Descending order 25:54 Lecture 64 Problem session Finding the smallest number 5:22 Lecture 65 Problem session Finding the largest number 3:26

#### Section 6 : CH 1 The Basics Formation of Numbers

 Lecture 66 Formation of Numbers - 1 6:2 Lecture 67 Formation of Numbers - 2 19:5 Lecture 68 Formation of Numbers - 3 17:18 Lecture 69 Formation of Numbers - 4 25:5 Lecture 70 Problem session - 1 17:44 Lecture 71 Problem session - 2 15:35 Lecture 72 Problem session - 3 14:4 Lecture 73 Problem session - 4 6:45 Lecture 74 Formation of Numbers - 5 14:39 Lecture 75 Formation of Numbers - 6 9:9 Lecture 76 Problem session - 5 16:36 Lecture 77 Problem session - 6 19:37 Lecture 78 Problem session - 7 14:9 Lecture 79 Problem session - 8 19:50 Lecture 80 Problem session - 9 15:6 Lecture 81 Problem session - 10 10:38

#### Section 7 : CH 1 The Basics Forming the greatest and the smallest number

 Lecture 82 Forming the greatest and the smallest numbers with the given digits 20:30 Lecture 83 Problem session - 1 6:54 Lecture 84 Problem session - 2 8:58

#### Section 8 : CH 1 The Basics The smallest and the greatest numbers of n-digits

 Lecture 85 The smallest and the greatest numbers of n-digits 14:37 Lecture 86 Problem session - 1 5:1 Lecture 87 Problem session - 2 4:46 Lecture 88 Some patterns 4:28

#### Section 9 : CH 1 The Basics Rounding off

 Lecture 89 Rounding off - Introduction 9:48 Lecture 90 Rule - Rounding off to nearest tens 9:37 Lecture 91 Examples - Rounding off to nearest tens 11:35 Lecture 92 Problem session - Rounding off to nearest tens 14:3 Lecture 93 Rule - Rounding off to nearest hundreds 8:1 Lecture 94 Examples - Rounding off to nearest hundreds 8:26 Lecture 95 Problem session - Rounding off to nearest hundreds 16:22 Lecture 96 Rule - Rounding off to nearest thousands 7:56 Lecture 97 Examples - Rounding off to nearest thousands 5:55 Lecture 98 Problem session - Rounding off to nearest thousands 15:16 Lecture 99 Problem session - Rounding off 19:4 Lecture 100 Rounding off to nearest ten-thousands and further 8:24

#### Section 10 : CH 1 The Basics Estimation

 Lecture 101 Estimation - Introduction 9:27 Lecture 102 Understanding estimation - Example 8:58 Lecture 103 Understanding estimation - Examples 9:23 Lecture 104 Uderstanding estimation - Examples 14:53 Lecture 105 Estimation - Theoritical points 20:34 Lecture 106 Understanding estimation - Example 4:34 Lecture 107 Understanding estimation - Example 3:33 Lecture 108 General rule of estimation 2:27 Lecture 109 Problem session - 1 7:35 Lecture 110 Problem session - 2 2:36 Lecture 111 Problem session - 3 2:47 Lecture 112 'Estimation in lower places' vs 'Estimation in higher places' 4:24

#### Section 11 : CH 2 Factors and Multiples

 Lecture 113 What is a 'Product' 3:13 Lecture 114 What is a 'Factor' 8:7 Lecture 115 What is a 'Multiple' 4:20 Lecture 116 Properties of 'Factors' 11:49 Lecture 117 Properties of 'Multiples' 6:11 Lecture 118 How to find 'Factors' 5:42 Lecture 119 Problem session - Finding 'Factors' 21:23 Lecture 120 How to find 'Multiples' 1:15 Lecture 121 Problem session - Finding 'Multiples' 10:46 Lecture 122 What are 'Common factors' 9:43 Lecture 123 Problem session - Finding 'Common factors' 13:48 Lecture 124 What are 'Common multiples' 4:22 Lecture 125 Problem session - Finding 'Common multiples' 14:6 Lecture 126 Insight on 'Prime numbers' and 'composite numbers' 10:33 Lecture 127 What are 'Prime numbers' 4:28 Lecture 128 What are 'Composite numbers' 3:57 Lecture 129 Which number is 'Neither prime nor composite' 0:54 Lecture 130 Which number is 'Both prime and composite' 0:57 Lecture 131 What is 'Sieve of Eratosthenes' 15:47 Lecture 132 Steps to write 'Sieve of Eratosthenes' 5:46 Lecture 133 Problem session - Based on 'Sieve of Eratosthenes' 13:4 Lecture 134 Problem session - Testing primality of a number between 1 and 100 10:25 Lecture 135 Properties of Prime numbers 18:39 Lecture 136 Problem session - Properties of Prime numbers 6:26 Lecture 137 Test of Prime 9:17 Lecture 138 Problem session - Test of Prime 11:42 Lecture 139 Problem session - Test of Prime 9:19 Lecture 140 Proof of 'Primality test for numbers upto 100' 2:1 Lecture 141 Problem session - Test of Prime 1:17 Lecture 142 Problem session - Test of Prime 1:16 Lecture 143 What is 'Factorisation' 9:6 Lecture 144 What is 'Prime factorisation' 6:13 Lecture 145 'Factorisation' vs 'Prime factorisation' 3:40 Lecture 146 Fundamental theorem of Arithmetic 3:14 Lecture 147 How to find 'Prime factorisation' 5:25 Lecture 148 Problem session - Finding Prime factorisation 19:42 Lecture 149 Problem session - Prime factorisation 1:19 Lecture 150 Problem session - Prime factorisation 1:37 Lecture 151 Problem session - Prime factorisation 2:41 Lecture 152 Problem session - Prime factorisation 5:37 Lecture 153 Problem session - Prime factorisation 2:7 Lecture 154 Problem session - Prime factorisation 1:5 Lecture 155 Problem session - Prime factorisation 2:19 Lecture 156 Importance of 'Prime factors' and 'Prime factorisation' 2:6 Lecture 157 What is 'HCF' 8:3 Lecture 158 Different names of HCF 2:27 Lecture 159 HCF of two numbers - Method 1 2:16 Lecture 160 HCF of two numbers - Method 2 1:47 Lecture 161 HCF of two numbers - Method 3 1:35 Lecture 162 HCF of two numbers - Method 4 3:55 Lecture 163 HCF of two numbers - Method 5 1:30 Lecture 164 HCF of two numbers - Method 6 1:36 Lecture 165 HCF of two numbers - Method 7 3:10 Lecture 166 HCF of two numbers - Method 8 1:56 Lecture 167 HCF of two numbers - All 8 methods 6:39 Lecture 168 HCF of more than two numbers - Method 1 Lecture 169 HCF of more than two numbers - Method 2 2:14 Lecture 170 HCF of more than two numbers - Method 3 1:38 Lecture 171 HCF of more than two numbers - Method 4 2:34 Lecture 172 HCF of more than two numbers - Method 5 1:26 Lecture 173 HCF of more than two numbers - Method 6 1:35 Lecture 174 HCF of more than two numbers - Method 7 Lecture 175 Problem session - Finding HCF 23:5 Lecture 176 What is 'LCM' 11:0 Lecture 177 LCM of two numbers - Method 1 1:47 Lecture 178 LCM of two numbers - Method 2 4:4 Lecture 179 LCM of two numbers - Method 3 4:38 Lecture 180 LCM of two numbers - Method 4 1:56 Lecture 181 LCM of two numbers - Method 5 3:8 Lecture 182 LCM of two numbers - Method 6 1:45 Lecture 183 LCM of two numbers - Method 7 2:1 Lecture 184 LCM of two numbers - All 6 methods 6:44 Lecture 185 LCM of more than two numbers - Method 1 5:49 Lecture 186 LCM of more than two numbers - Method 2 2:33 Lecture 187 LCM of more than two numbers - Method 3 2:43 Lecture 188 LCM of more than two numbers - Method 4 2:50 Lecture 189 LCM of more than two numbers - Method 5 2:3 Lecture 190 LCM of more than two numbers - Method 6 1:48 Lecture 191 Problem session - Finding LCM 22:35 Lecture 192 Problem session - HCF vs LCM 17:33 Lecture 193 What are 'Coprime numbers' 3:46 Lecture 194 What are 'Twin-primes' 1:16 Lecture 195 What is a 'Perfect number' 2:46 Lecture 196 What is a 'Prime-triplet' 1:27 Lecture 197 What are 'Even numbers' and 'Odd numbers' 4:37 Lecture 198 Properties of HCF and LCM 15:53 Lecture 199 Problem session - Properties of HCF and LCM 3:21 Lecture 200 Relation between HCF, LCM and product of two numbers 11:51 Lecture 201 Problem session - Relation between HCF, LCM and product of two numbers 6:14 Lecture 202 HCF word problems - Introduction 11:51 Lecture 203 Problem session - Word problems on HCF 19:5 Lecture 204 Problem session - Word problems on HCF 16:55 Lecture 205 Problem session - Word problems on HCF 22:22 Lecture 206 LCM word problems - Introduction 5:5 Lecture 207 Problem session - Word problems on LCM 12:51 Lecture 208 Problem session - Word problems on LCM 12:23 Lecture 209 Problem session - Word problems on LCM 10:26 Lecture 210 Problem session - Problems on HCF and LCM 15:54 Lecture 211 Problem session - Problems on HCF and LCM 15:15 Lecture 212 Problem session - Problems on HCF and LCM 10:14 Lecture 213 Problem session - Word problems on HCF and LCM 13:1 Lecture 214 Problem session - Word problems on HCF and LCM 13:38 Lecture 215 Problem session - Word problems on HCF and LCM 9:50

#### Section 12 : CH 3 Rules of Divisibility

 Lecture 216 First rule of divisibility 4:25 Lecture 217 Problem session 0:51 Lecture 218 Second rule of divisibility 2:27 Lecture 219 Problem session 1:14 Lecture 220 Third rule of divisibility 1:10 Lecture 221 Problem session 1:5 Lecture 222 Problem session 5:18 Lecture 223 Problem session 3:31 Lecture 224 Fourth rule of divisibility 2:41

#### Section 13 : CH 4 Divisibility Tests (with proofs)

 Lecture 225 What is 'Divisibility test' 2:8 Lecture 226 Division by 0 1:7 Lecture 227 Divisibility test of 1 0:41 Lecture 228 Divisibility test of 2 2:36 Lecture 229 Problem session - Divisibility test of 2 1:21 Lecture 230 Proof of 'divisibility test of 2' 3:30 Lecture 231 Divisibility test of 3 3:10 Lecture 232 Problem session - Divisibility test of 3 3:17 Lecture 233 Proof of 'divisibility test of 3' 4:52 Lecture 234 Divisibility test of 4 2:13 Lecture 235 Problem session - Divisibility test of 4 2:56 Lecture 236 Proof of 'divisibility test of 4' 3:6 Lecture 237 Divisibility test of 5 1:17 Lecture 238 Problem session - Divisibility test of 5 0:55 Lecture 239 Proof of 'divisibility test of 5' 2:30 Lecture 240 Divisibility test of 6 2:20 Lecture 241 Problem session - Divisibility test of 6 3:19 Lecture 242 Proof of 'divisibility test of 6' 1:7 Lecture 243 Divisibility test of 7 10:28 Lecture 244 Problem session - Divisibility test of 7 2:34 Lecture 245 Proof of 'divisibility test of 7' 9:38 Lecture 246 Divisibility test of 8 1:16 Lecture 247 Problem session - Divisibility test of 8 3:22 Lecture 248 Proof of 'divisibility test of 8' 1:31 Lecture 249 Divisibility test of 9 2:55 Lecture 250 Problem session - Divisibility test of 9 2:51 Lecture 251 Proof of 'divisibility test of 9' 1:41 Lecture 252 Divisibility test of 10 0:34 Lecture 253 Problem session - Divisibility test of 10 0:53 Lecture 254 Proof of 'divisibility test of 10' 2:16 Lecture 255 Divisibility test of 11 13:21 Lecture 256 Problem session - Divisibility test of 11 7:49 Lecture 257 Proof of 'divisibility test of 11' 11:9 Lecture 258 Divisibility test of 12 2:48 Lecture 259 Proof of 'divisibility test of 12' 1:11 Lecture 260 Divisibility test of 13 2:37 Lecture 261 Proof of 'divisibility test of 13' 4:30 Lecture 262 Divisibility test of 14 3:1 Lecture 263 Proof of 'divisibility test of 14' 0:57 Lecture 264 Divisibility test of 15 2:8 Lecture 265 Proof of 'divisibility test of 15' 0:59 Lecture 266 Coprime factors test 4:20 Lecture 267 Revision of divisibility tests of natural numbers upto 15 5:19 Lecture 268 Problem session - Divisibility tests upto 15 2:19

#### Section 14 : CH 5 Number System The various number systems

 Lecture 269 Number System - Introduction 9:3 Lecture 270 Natural numbers 20:8 Lecture 271 Problem session - Natural numbers 7:6 Lecture 272 Whole numbers - Part 1 24:34 Lecture 273 Whole numbers - Part 2 10:10 Lecture 274 Problem session - Whole numbers 6:14 Lecture 275 Integers - Part 1 22:46 Lecture 276 Integers - Part 2 24:37 Lecture 277 Problem session - Integers 2:27 Lecture 278 Problem session - Integers 4:42 Lecture 279 Problem session - Integers on number line 3:57 Lecture 280 Fractions - Part 1 17:56 Lecture 281 Fractions - Part 2 19:10 Lecture 282 Fractions - Part 3 16:38 Lecture 283 Fractions - Part 4 21:34 Lecture 284 Fractions - Part 5 11:31 Lecture 285 Fractions - Part 6 16:42 Lecture 286 Fractions - Part 7 16:2 Lecture 287 Fractions - Part 8 9:43 Lecture 288 Fractions - Part 9 21:34 Lecture 289 Problem session - Fractions 3:8 Lecture 290 Problem session - Fractions 2:9 Lecture 291 Problem session - Fractions (shading) 3:25 Lecture 292 Problem session - Fractions (shading) 2 1:6 Lecture 293 Problem session - Fractions (proper, improper, mixed) 2:52 Lecture 294 Problem session - Fractions (simplest form) 4:17 Lecture 295 Problem session - Fractions (equivalent fractions) 4:46 Lecture 296 Problem session - Fractions (like and unlike) 3:2 Lecture 297 Problem session - Fractions (plotting) 6:0 Lecture 298 Problem session - Fractions (word problems) 4:37 Lecture 299 Rational numbers - Part 1 15:42 Lecture 300 Rational numbers - Part 2 12:19 Lecture 301 Rational numbers - Part 3 3:39 Lecture 302 Rational numbers - Part 4 7:38 Lecture 303 Rational numbers - Part 5 2:26 Lecture 304 Rational numbers - Part 6 2:57 Lecture 305 Rational numbers - Part 7 4:5 Lecture 306 Rational numbers - Part 8 2:51 Lecture 307 Rational numbers - Part 9 1:25 Lecture 308 Rational numbers - Part 10 19:55 Lecture 309 Rational numbers - Part 11 25:24 Lecture 310 Rational numbers - Part 12 10:40 Lecture 311 Rational numbers - Part 13 9:33 Lecture 312 Rational numbers - Part 14 5:35 Lecture 313 Rational numbers - Part 15 3:56 Lecture 314 Rational numbers - Part 16 1:37 Lecture 315 Rational numbers - Part 17 26:0 Lecture 316 Rational numbers - Part 18 10:53 Lecture 317 Rational numbers - Part 19 9:16 Lecture 318 Rational numbers - Part 20 17:42 Lecture 319 Problem session - Rational numbers 3:17 Lecture 320 Problem session - Rational numbers 1 3:14 Lecture 321 Problem session - Rational numbers 2 5:38 Lecture 322 Problem session - Rational numbers 3 3:20 Lecture 323 Problem session - Rational numbers 4 2:56 Lecture 324 Recap of Number systems - Part 1 13:34 Lecture 325 Recap of Number systems - Part 2 10:23 Lecture 326 God made Integers, rest are man-made 5:13

#### Section 15 : CH 5Number System Comparison and ordering of numbers of various number systems

 Lecture 327 Comparison and Ordering of Numbers - Introduction 1:23 Lecture 328 Comparison of Natural numbers - Introduction 4:24 Lecture 329 Comparison of Natural numbers - Method 1 7:51 Lecture 330 Comparison of Natural numbers - Method 2 6:38 Lecture 331 Comparison of Natural numbers - Method 3 13:25 Lecture 332 Comparison of Natural numbers - All 3 methods 4:44 Lecture 333 Ordering of Natural numbers 3:49 Lecture 334 Comparison of Whole numbers - Introduction 3:7 Lecture 335 Comparison of Whole numbers - Method 1 4:40 Lecture 336 Comparison of Whole numbers - Method 2 3:42 Lecture 337 Comparison of Whole numbers - Method 3 8:1 Lecture 338 Comparison of Whole numbers - All 3 methods 3:43 Lecture 339 Ordering of Whole numbers 3:20 Lecture 340 Comparison of Integers - Introduction 3:47 Lecture 341 Absolute value or modulus of an Integer 19:2 Lecture 342 Problem session - Plotting Integers 2:16 Lecture 343 Comparison of Integers - Method 1 16:44 Lecture 344 Comparison of Integers - Method 2 12:28 Lecture 345 Comparison of Integers - Method 3 11:13 Lecture 346 Comparison of Integers - All 3 methods 5:55 Lecture 347 Ordering of Integers 3:52 Lecture 348 Problem session - Comparison of integers 2:22 Lecture 349 Problem session - Comparison of Integers 4:34 Lecture 350 Comparison of Fractions - Introduction 9:33 Lecture 351 Comparison of Fractions - Method 1 7:56 Lecture 352 Comparison of Fractions - Method 2 10:51 Lecture 353 Comparison of Fractions - Method 3 11:5 Lecture 354 Comparison of Fractions - Method 4 5:5 Lecture 355 Comparison of Fractions (Mixed fractions) - Method 5 10:16 Lecture 356 Comparison of Fractions - Method 6 7:24 Lecture 357 Comparison of Fractions - Method 7 5:51 Lecture 358 Comparison of Fractions - Method 8 Lecture 359 Comparison of Fractions - All 8 methods 10:37 Lecture 360 Ordering of Fractions 5:43 Lecture 361 Problem session - Comparison of fractions 4:17 Lecture 362 Comparison of Rational numbers - Introduction 4:54 Lecture 363 Comparison of Rational numbers - Method 1 10:39 Lecture 364 Comparison of Rational numbers - Method 2 16:50 Lecture 365 Comparison of Rational numbers - Method 3 5:39 Lecture 366 Comparison of Rational numbers - All 7 methods 12:57 Lecture 367 Ordering of Rational numbers 4:51 Lecture 368 Problem session - Comparison of rational numbers 4:42

#### Section 17 : CH 5 Number System Properties of numbers of various number systems

 Lecture 422 Closure Property - Introduction 11:1 Lecture 423 Closure property for Natural numbers 15:14 Lecture 424 Closure property for Whole numbers 10:43 Lecture 425 Closure property for Integers 10:15 Lecture 426 Closure property for Fractions 14:37 Lecture 427 Closure property for Rational numbers 10:55 Lecture 428 Summary of Closure property 10:25 Lecture 429 Commutative Property - Introduction 6:31 Lecture 430 Commutative property for Natural numbers 7:7 Lecture 431 Commutative property for Whole numbers 6:9 Lecture 432 Commutative property for Integers 6:29 Lecture 433 Commutative property for Fractions 9:38 Lecture 434 Commutative property for Rational numbers 10:24 Lecture 435 Summary of Commutative property 14:12 Lecture 436 Associative Property - Introduction 5:41 Lecture 437 Associative property for Natural numbers 11:26 Lecture 438 Associative property for Whole numbers 10:1 Lecture 439 Associative property for Integers 9:28 Lecture 440 Associative property for Fractions 16:15 Lecture 441 Associative property for Rational numbers 12:57 Lecture 442 Summary of Associative property 9:59 Lecture 443 Distributive Property - Introduction 13:15 Lecture 444 Distributive property for Natural numbers 5:42 Lecture 445 Distributive property for Whole numbers 4:9 Lecture 446 Distributive property for Integers 4:18 Lecture 447 Distributive property for Fractions 10:40 Lecture 448 Distributive property for Rational numbers 12:31 Lecture 449 Summary of Distributive property 14:53 Lecture 450 Why do we multiply the way we multiply 13:2 Lecture 451 Additive Identity and Multiplicative Identity - Introduction 6:31 Lecture 452 Additive Identity and Multiplicative Identity for Natural numbers 4:30 Lecture 453 Additive Identity and Multiplicative Identity for Whole number 2:43 Lecture 454 Additive Identity and Multiplicative Identity for Integers 2:44 Lecture 455 Additive Identity and Multiplicative Identity for Fractions 3:22 Lecture 456 Additive Identity and Multiplicative Identity for Rational Numbers 3:25 Lecture 457 Summary of Additive Identity and Multiplicative Identity 2:59 Lecture 458 Multiplication and Division by ZERO (0) 3:5

#### Section 18 : CH 6 Decimal Numbers

 Lecture 459 Revision of 'Integers' 4:42 Lecture 460 Integral powers of 10 5:2 Lecture 461 Understanding numbers 8:12 Lecture 462 'Place values' and 'Place value table' 4:32 Lecture 463 'Place value table' and 'Integral powers of 10' 3:38 Lecture 464 Extension of 'Place value table' towards right of ones place 5:56 Lecture 465 Expansion of numbers written in place value table 3:32 Lecture 466 Obtaining a number written in place value table 3:6 Lecture 467 Introducing the 'Decimal point' 5:33 Lecture 468 Obtaining a number written in place value table 5:48