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b. Mental Maths
16
+ 1. 51 2. 82 3. 75
12 31 20 32 50 38 37
16 15 5 17 15 35 16 22 15
20 + 8 = 28 = 14 + 14 5 11 4 1 12 5 10 25 4 12 10 5
HOTS
15 a. 13 marbles b. 3 marbles c. 9 marbles
+
13 (Answer may vary) Chapter 4: Numbers up to 1000
Warm Up
3. a. 41 1. Glitter bulbs 2. Lanterns 3. Gifts
b. T O c. T O 4. Glitter bulbs, gifts, candles, sweets, diyas, lanterns
2 T O 5 T O 5. 215: Two hundred fifteen, 155: One hundred fifty-five, 35: Thirty-five,
3 6 = 1 0 3 5 = 4 0 260: Two hundred sixty
+ 8 + 3 6 + 2 4 + 2 4 Exercise 4A
1. a. 3 hundreds + 3 tens + 9 ones = 339
4 6 4 6 6 4 6 4
339 is read as Three hundred thirty-nine
4. 52 ribbons 5. 45 students b. 8 hundreds + 5 tens + 9 ones = 859
Mental Maths 859 is read as Eight hundred fifty-nine
1. 4 + 7 + 9 = 20 2. 5 + 7 + 9 = 21 3. 9 + 11 + 15 = 35 c. 5 hundreds + 1 ten + 2 ones = 512
512 is read as Five hundred twelve
4. 4 + 11 + 15 = 30 (Answer may vary)
HOTS 2.
1. 2. 15 3. 301 302 303 304 305 306 307 308 309 310 311 312
21 23
9 12 9 6 11 12 322 321 320 319 318 317 316 315 314 313
2 7 5 5 4 2 3 8 4 323 324 325 326 327 328 329 330 331 332 333 334
344 343 342 341 340 339 338 337 336 335
345 346 347 348 349 350 351 352 353 354 355 356
Chapter 3: Subtraction 366 365 364 363 362 361 360 359 358 357
Warm Up 367 368 369 370 371 372 373 374 375 376 377 378
8 – 7 = 1, 17 – 4 = 13, 9 – 9 = 0, 6 – 4 = 2, 17 – 10 = 7, 9 – 6 = 3, 16 – 9 = 7,
13 – 13 = 0, 21 – 10 = 11, 15 – 15 = 0 388 387 386 385 384 383 382 381 380 379
Number of kites going up = 7; Number of kites coming down = 3 389 390 391 392 393 394 395 396 397 398 399 400
Exercise 3A 3. a. 311 312 313 314 315 316
1. a. 26 b. 0 c. 0 d. 93 e. 56 f. 1 b. 421 422 423 424 425 426 427 428
g. 18 h. 42 i. 55
2. a. 21 b. 44 c. 41 d. 18 e. 76 f. 27 c. 667 668 669 670 671 672 673 674
g. 53 h. 61 i. 11 d. 850 851 852 853 854 855 856 857
Exercise 3B e. 929 930 931 932 933 934 935 936
1. a. 2 tens 10 ones b. 5 tens 6 ones = 4 tens 16 ones 4. a. 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438,
c. 5 tens 1 one = 4 tens 11 ones 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452,
2. a. 3 b. 10 c. 4 453, 454, 455, 456, 457, 458, 459, 460
3. a. 5 tens + 7 ones = 4 tens + 17 ones b. 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577,
b. 6 tens + 3 ones = 5 tens + 13 ones 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590,
c. 7 tens + 0 ones = 6 tens + 10 ones 591, 592, 593, 594, 595, 596, 597, 598, 599, 600, 601, 602, 603,
4. a. 13 ones b. 15 ones c. 16 ones 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616,
617, 618, 619, 620, 621, 622, 623, 624, 625
Exercise 3C
1. a. 37 b. 30 c. 18 d. 35 e. 37 f. 29 c. 682, 683, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694,
g. 89 h. 44 695, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707,
2. a. 35 b. 17 c. 22 d. 69 e. 11 f. 34 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722,
723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
g. 24 h. 48 737, 738, 739, 740, 741, 742
Exercise 3D d. 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872,
1. small box, 15 balls 2. 11 students 3. 12 books 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885,
4. Puja, 8 stamps 5. 44 pages 886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 897, 898,
Learning Logs 899, 900, 901, 902, 903, 904, 905, 906, 907, 908, 909, 910
1. a. 30 b. 18 c. 21 d. 14 e. 20 f. 25 5. b. 309 c. 359 d. 204 e. 855 f. 412
g. 48 h. 41 g. 539 h. 939
2. 33 DVDs 3. 11 balloons 4. 19 students
6. b. Four hundred fifty-seven c. Seven hundred eighty-nine
5. a. 54, 74; 19, 39; 18, 38; 45, 65; 55, 75 d. Five hundred thirty-four e. Eight hundred eighty-eight
b. 53; 28, 68; 11, 51; 4, 44; 46, 86; 68, 108 f. Nine hundred ninety-nine g. Five hundred four
c. 22, 82; 9, 69; 1, 61; 20, 80, 38, 98; 15, 75 h. Seven hundred twelve

190 Mathematics 2