Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 947 · 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. 1.780 − 221 =
2. 2.A school has 731 children. 221 of them are girls. How many boys are there?
3. 3.844 − ? = 80
4. 4.143 + ? = 290
5. 5.742 − 741 =
6. 6.? + 263 = 737
7. 7.631 − 160 =
8. 8.936 − ? = 536
9. 9.751 + 217 =
10. 10.229 + 678 =
11. 11.457 + ? = 602
12. 12.? + 826 = 927
13. 13.574 − 465 =
14. 14.A school has 525 children. 133 of them are girls. How many boys are there?
15. 15.554 − 107 =
16. 16.A school has 367 children. 347 of them are girls. How many boys are there?
17. 17.292 − 180 =
18. 18.223 − 137 =
19. 19.218 + ? = 838
20. 20.A school has 935 children. 324 of them are girls. How many boys are there?
21. 21.A school has 554 children. 119 of them are girls. How many boys are there?
22. 22.383 − 281 =
23. 23.120 + ? = 800
24. 24.358 − 155 =
25. 25.298 − 261 =
26. 26.859 + 136 =
27. 27.899 − 745 =
28. 28.A school has 240 children. 143 of them are girls. How many boys are there?
29. 29.983 − 916 =
30. 30.772 − 629 =
31. 31.700 − 569 =
32. 32.? − 358 = 56
33. 33.637 − ? = 519
34. 34.A train has 532 people in the front coaches and 360 people in the back coaches. How many people are on the train?
35. 35.A school has 805 children. 421 of them are girls. How many boys are there?
36. 36.325 + 670 =
37. 37.A train has 813 people in the front coaches and 128 people in the back coaches. How many people are on the train?
38. 38.570 − 161 =
39. 39.? + 298 = 914
40. 40.351 − 219 =

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