Page 206 - Math Genius C2

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Answers

Chapter 1. Numbers up to 999 4. (b) 612 (c) 499
5. (b) 256 (c) 148
GET READY! Practice Time 1F
1. 86 – Eighty-six 2. 87, 60 1. (a) 75, 87, 120, 163, 266 (b) 45, 142, 182, 215, 276
3. 87 is just after 86 or 87 is the successor of 86. (c) 110, 112, 180, 243, 271 (d) 113, 119, 145, 172, 190
Fast Check (Page 8) (e) 146, 201, 259, 263, 297
1. 100 2. 10 2. (a) 272, 230, 211, 98, 47 (b) 239, 218, 205, 152, 44
Think Tank (Page 10) (c) 298, 280, 260, 245, 241 (d) 265, 200, 195, 183, 141
(e) 981, 957, 825, 285, 198
175 3. 567, 576, 657, 675, 756, 765; 765, 756, 675, 657, 576, 567
Practice Time 1A 4. (b) 749, 751 (c) 891, 892 (d) 844, 845 (e) 622, 624
1. (a) 154 – One hundred fifty-four (b) 146 – One hundred forty-six 5. Number Predecessor Successor
(c) 170 – One hundred seventy
2. (b) One hundred fifty-two (c) One hundred sixty-six Greatest 910 909 911
(d) One hundred thirty-two (e) One hundred forty-five Smallest 109 108 110
(f) One hundred ninety-eight
3. (b) 126 (c) 152 (d) 175 (e) 103 (f) 114 Practice Time 1G
4. 118; 104; 194; 123; 181 5. 136; 110; 174; 167; 121 1. (b) 10 toffees, even (c) 12 flowers, even (d) 9 apples, odd
6. 168, 199; 116, 161; 127, 176 2. 14, 16, 18, 20, 22, 24, 26, 28, 30
Practice Time 1B 3. 29, 31, 33, 35, 37, 39, 41, 43, 45
4.
1. (a) 337 – Three hundred thirty-seven (b) 858 – Eight hundred fifty-eight 5. (a) 32, 34, 36, 38 (b) 62, 64, 66, 68, 70, 72
(b) 81, 83, 85, 87, 89
(a) 51, 53, 55, 57, 59
3. (b) 309 (c) 659 (d) 204 (e) 855 Practice Time 1H
(f) 412 (g) 536 (h) 981
4. (b) Four hundred fifty-seven (c) Seven hundred eighty-nine 1. (b) fourth (c) ninth (d) first (e) Ria
(d) Five hundred thirty-four (e) Eight hundred eighty-eight (f) Bindia (g) Akhil (h) Tony (i) Sunny
(j) Rohit
(f) Nine hundred ninety-nine (g) Five hundred four 2. (b) 5th (c) 6th (d) 3rd
(h) Seven hundred sixteen 3. (a) 2nd, 7th, 13th, 17th (b) 5th, 9th, 11th, 16th
5. (a) 367 (b) 538 (c) 571 (d) 623 (c) red, purple, red, black
(e) 240 (f) 794 Mental Maths (Page 30)
6. (a) 285 (b) 349 (c) 640 (d) 698 (e) 713 (f) 889
7. (a) 617 (b) 550 (c) 712 (d) 492 (e) 800 (f) 872 1. (a) 98 (b) 11 (c) 101 (d) 888
2.
(a) Store 3
Practice Time 1C Chapter Assessment (b) Store 2
1. (b) 650 (c) 706 (d) 895 1. (b) 2. (c) 3. (a)
Think Tank (Page 17) 4. (a) 269, 270, 271, 272, 273, 274, 275, 277, 278, 279
102 (b) 358, 359, 360, 361, 362, 363, 365, 366, 367, 368
Practice Time 1D 5. (a) 748 (b) 690
(a) 371 = 300 + 70 + 1 (b) 719 = 700 + 10 + 9 (c) 538 = 500 + 30 + 8
6.
1. (a) 60 (b) 800 (c) 4 7. (a) 157 (b) 99 (c) 65 (d) 250
2. (a) H T O 8. (a) A.O.: 118, 132, 140, 172; D.O.: 172, 140, 132, 118
Place Face (b) A.O.: 128, 153, 164, 174; D.O.: 174, 164, 153, 128
2 1 5 value value (c) A.O.: 213, 217, 222, 240; D.O.: 240, 222, 217, 213
5 5 (d) A.O.: 148, 238, 284, 298; D.O.: 298, 284, 238, 148
Challenge Question (Page 32)
10 1 Mystery Number 1: 999; Mystery Number 2: 978
200 2 Chapter 2. Addition
(b) H T O GET READY!
Place Face
38
7 0 9 value value Think Tank (Page 35)
9 9 14
0 0 Maths Fun (Page 37)
Team A Score: Nobita (7) + Gian (5) + Dorami (5) + Dekisugi (7) = 24
700 7 Team B Score: Doraemon (6) + Shizuka (2) + Jaiko (6) + Suneo (8) = 22
3. (b) 727 (c) 503 Team A is the winner.
4. (b) 2 hundreds + 2 tens + 7 ones; 200 + 20 + 7 Practice Time 2A
(c) 9 hundreds + 4 tens + 5 ones; 900 + 40 + 5 1. (a) 0 (b) 48 (c) 1
(d) 4 hundreds + 8 tens + 0 ones; 400 + 80 + 0 or 400 + 80 2. (a) 35 (b) 34
5. (a) 759 (b) 231 (c) 333 3. (b) 79 (c) 85 (d) 66
6. (a) 230 (b) 465 (c) 507 (d) 729 Practice Time 2B
Practice Time 1E 1. 57 2. 99 3. 68 4. 78
1. (a) < (b) > (c) < (d) > (e) = 5. 77 6. 87 7. 69 8. 89
(f) = (g) > (h) < Practice Time 2C
2. Any number from 201 to 211. 1. (a) 4 tens + 4 ones (b) 5 tens + 7 ones
3. 8; 992, 993, 994, 995, 996, 997, 998, 999 (c) 7 tens + 0 ones (d) 8 tens + 1 one

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