Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 851 · 40 sums

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

1. 1.482 − 110 =
2. 2.908 − 206 =
3. 3.846 + 120 =
4. 4.A school has 428 children. 311 of them are girls. How many boys are there?
5. 5.633 + ? = 988
6. 6.673 + 107 =
7. 7.521 + ? = 909
8. 8.758 − 156 =
9. 9.701 + 200 =
10. 10.? + 705 = 975
11. 11.A train has 246 people in the front coaches and 329 people in the back coaches. How many people are on the train?
12. 12.982 − 599 =
13. 13.? + 830 = 937
14. 14.A train has 191 people in the front coaches and 264 people in the back coaches. How many people are on the train?
15. 15.836 − 822 =
16. 16.A train has 578 people in the front coaches and 301 people in the back coaches. How many people are on the train?
17. 17.? + 221 = 336
18. 18.431 − 410 =
19. 19.A school has 365 children. 235 of them are girls. How many boys are there?
20. 20.? + 374 = 693
21. 21.A school has 337 children. 254 of them are girls. How many boys are there?
22. 22.391 + 373 =
23. 23.595 − ? = 57
24. 24.500 − 244 =
25. 25.A school has 585 children. 206 of them are girls. How many boys are there?
26. 26.446 + 199 =
27. 27.389 − 216 =
28. 28.387 − 375 =
29. 29.A school has 670 children. 359 of them are girls. How many boys are there?
30. 30.? − 225 = 350
31. 31.269 + 496 =
32. 32.472 − 103 =
33. 33.351 − ? = 175
34. 34.445 + 114 =
35. 35.761 + 233 =
36. 36.225 + ? = 504
37. 37.637 − ? = 485
38. 38.700 + 261 =
39. 39.618 + 275 =
40. 40.175 + 303 =

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