Page 250 - Math Genius C4

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Mental Maths (Page 26) Practice time 2F
1. 700 2. 872500 3. 124 1. 17970 bag 2. 6856 TV sets 3. 84498 litres
Challenge Question (Page 27) 4. `32400 5. 104759 spectators 6. `182492
Practice time 2G
1. 98,760 2. 1,23,450 3. 9,87,065
1. (a) 20504 (b) 41244 (c) 101101 (d) 41548
Chapter assessment
(e) 83571
1. (a) (iii) (b) (i) (c) (ii) (d) (iv) 2. 34625 3. 2426
2. (a) 5; 5000 (b) 8 (c) 0 (d) 7 (e) 4 Challenge Question (Page 46)
3. (a) (iv) (b) (i) (c) (ii) (d) (iii) `1,67,432
4. (a) 3 (b) 5 (c) 4 Challenge Question (Page 47)
5. (a) 56,307; 56,309 (b) 2,10,500; 2,10,300
(c) 5,82,354; 7,82,354 X = 20202, Y = 90909
6. (a) 105788, 105888, 105988 (b) 694345, 695345, 696345 Practice time 2H
7. Three lakh twenty-five thousand five hundred one 1. (a) 3000 (b) 12000 (c) 17000 (d) 60000
8. Current year 9. Narayan’s father (e) 90000 (f) 40000 (g) 40000 (h) 40000
10. 90,000 11. 10,001, 1,00,001 (Answer may vary) (i) 90000
12. (a) False (b) False (c) False (d) True 2. (a) 2000 (b) 2000 (c) 25000 (d) 20000
(e) 50000 (f) 20000 (g) 20000 (h) 20000
Chapter 2. addition and subtraction (i) 90000
3. 210000; 5256
Let’s ReCaLL
Chapter assessment
1. (a) 5999 (b) 2714 2. 3656 1. (a) (ii) (b) (ii) (c) (i) (d) (iv) (e) (iv)
3. Total population = 994, difference in their population = 158
4. Samina, 34 words 2. (a) 5 7 3 9 5 2 (b) 6 7 2 9 3 4
Practice time 2a – 2 5 0 8 6 4 – 3 8 4 6 2 8
1. (a) 94654 (b) 379339 (c) 869689 (d) 934161 3 2 3 0 8 8 2 8 8 3 0 6
(e) 942866 (f) 527824
2. (a) 455743 (b) 989999 (c) 688994 (d) 789999 (c) 8 4 7 2 8 0
(e) 879384 (f) 929958 – 5 3 8 0 9 2
Practice time 2B 3 0 9 1 8 8
1. (a) 1 (b) 1 (c) 2436 (d) 0 3. `135000 4. 12275 workers 5. 31652 kits
(e) 0 (f) 9999 (g) 246 (h) 4021 6. C, 18972 votes 7. 3950 km 8. `16741 9. `31250
2. (a) 108 (b) 172 (c) 448 (d) 78 Mental Maths (Page 51)
(e) 740 (f) 199 (g) 735 (h) 409 1. (a) 5026 (b) 16784 (c) 86620 (d) 5093
3. (a) 99 (b) 64 (c) 183 (d) 362 2. (a) {10000, 45555} (b) {98989, 800000}
(e) 563 (f) 463 (g) 632 (h) 578
4. (a) 55 (b) 88 (c) 286 (d) 363 Chapter 3. Multiplication
(e) 388 (f) 306 (g) 560 (h) 429 Let's ReCaLL
5. (a) 269 (b) 668 (c) 579 (d) 1082 1. (a) 360 (b) 100 (c) 10 × 5 2. (a) 3756 (b) 1875 3. `1000
Practice time 2C Practice time 3a
1. `64200 1. (a) 11172 (b) 47474 (c) 65601
2. (a) `59600 (b) `64840 (c) `32740 (d) `78590 2. (a) 4936 (b) 18507 (c) 9364 (d) 53487
3. 110034 4. 115347 5. 376729 (e) 88299 (f) 43825 (g) 78992 (h) 41244
6. 251130 votes Challenge Question (Page 56)
Practice time 2D Odd number
1. (a) 23331 (b) 31292 (c) 37007 (d) 35272 Practice time 3B
(e) 17457 (f) 263867 1. 6696 2. 17759 3. 9774 4. 95680
2. (a) 12221 (b) 236211 (c) 641399 (d) 164787 5. 141056 6. 127932 7. 150886
3. (a) 441411 (b) 133510 (c) 263210 (d) 56746 Practice time 3C
4. 60150 5. 76015 6. 78618 1. 80925 2. 292817 3. 61380 4. 99944
5. 82992 6. 167328 7. 69375 8. 147839
Practice time 2e
Practice time 3D
1. (a) 43189 (b) 77781 (c) 0 (d) 64871 1. (a) 370 (b) 26800 (c) 102360 (d) 93
(e) 100 (f) 0 (g) 53956 (h) 158950 (e) 10 (f) 17200
(i) 0 2. (a) 7440 (b) 1350 (c) 23120 (d) 382400
2. (a) 5542 (b) 3271 (c) 4651 (d) 2322 (e) 27400 (f) 744000 (g) 83400 (h) 192000

248 Mathematics-4