Page 184 - Maths Class 04

Chapter-2 Addition and Subtraction
Practice 2.1
1. a. 9096; Less than 10000 b. 7996; More than 7650
2. a. 50 b. 30 c. 10 d. 10 e. 200 f. 400
3.
S. No. Add Rounding of Number Estimated Sum Actual Sum
a. 2815 + 3164 3000 + 3000 6000 5979
b. 6188 + 1937 6000 + 2000 8000 8125
c. 6321 + 2847 6000 + 3000 9000 9168
d. 3035 + 1885 3000 + 2000 5000 4920
e. 4391 + 2585 4000 + 3000 7000 6976
f. 8135 + 1062 8000 + 1000 9000 9197

4. a. 84514 b. 99035 c. 886023 d. 94582
e. 967774 f. 35839 g. 406501 h. 128429
Practice 2.2
1. a. 98978 b. 97777 c. 35986 d. 449878 e. 456776 f. 548416
2. a. 11423 b. 543267 c.
1 2 3 4 9
3. a. 127273 b. 37441
c. 61512 d. 706519 + 5 1 8 5 4
e. 858045 f. 929274 + 3 4 9 2 1
4. a. 88216 b. 16460 9 9 1 2 4
c. 23035 d. 44634
5. a. 111874 b. 104251 c. 25588 d. 28021 e. 9872 f. 58500
Practice 2.3
1. 57893 2. 42073 3. 0 4. 32967 5. 47830, 27945 6. 45932
Practice 2.4
1. 61851 spectators 2. 172352 students 3. 387875 tube lights; Total production = 626250
4. Population = 1123068 5. 82966 6. 1662145 7. 53957 books
8. 57609 bricks 9. 985521 10. 19608 teachers
Practice 2.5
1. a. 24081 b. 383488 c. 437963 d. 68790 e. 33832 f. 401127
g. 515824 h. 310480 2. a. b.
3. a. 1030 b. 877 8 7 6 9 4 5 7 2 1
– 2 4 4 3 3 – 2 5 1 5
6 3 2 6 1 3 2 0 6
Practice 2.6
1. 1 2. 4030 sets 3. ` 110480 4. Right 5. 847298
6. 761853 7. 29696 8. 643457 9. ` 73824 10. 567662 children
11. ` 346274 12. 26320 children
Practice 2.7
1. a. Actual difference = 1448 b. Actual difference = 4329
Estimated difference = 1450 Estimated difference = 4330
c. Actual difference = 7515 d. Actual difference = 4101
Estimated difference = 7520 Estimated difference = 4100
2. a. Actual difference = 4737 b. Actual difference = 1729
Estimated difference = 4700 Estimated difference = 1700
c. Actual difference = 6737 d. Actual difference = 3587
Estimated difference = 6700 Estimated difference = 3600
Sum Up
1. a. iii b. i c. ii d. i 2. a. 69998 b. 78693 c. 80810 d. 11111
e. 5555 f. 1112 g. 9999 h. 1000 3. 6 + 8 + 4 = 18
4. a. 125200 b. 201000 c. 461000 d. 510000 5. a. 652142 b. 17328 c. 353199 d. 224281
6. a. Mrs Patel got 2236 more votes 7. a. 79106 b. 74458 c. 871574

Mathematics-4 184