Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 918 · 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. 1.304 + ? = 635
2. 2.954 − 212 =
3. 3.? + 841 = 977
4. 4.507 + ? = 650
5. 5.770 + 159 =
6. 6.151 + ? = 703
7. 7.A train has 857 people in the front coaches and 119 people in the back coaches. How many people are on the train?
8. 8.476 − 459 =
9. 9.705 + ? = 919
10. 10.499 + ? = 630
11. 11.465 − 266 =
12. 12.145 + 840 =
13. 13.680 + ? = 925
14. 14.584 − ? = 8
15. 15.A school has 313 children. 106 of them are girls. How many boys are there?
16. 16.? + 544 = 932
17. 17.533 − 144 =
18. 18.A school has 261 children. 147 of them are girls. How many boys are there?
19. 19.472 − ? = 352
20. 20.A train has 695 people in the front coaches and 247 people in the back coaches. How many people are on the train?
21. 21.? − 240 = 464
22. 22.270 + 243 =
23. 23.585 + ? = 939
24. 24.237 + 144 =
25. 25.? − 152 = 541
26. 26.354 − 223 =
27. 27.893 + 102 =
28. 28.511 + ? = 709
29. 29.373 + ? = 759
30. 30.A train has 641 people in the front coaches and 304 people in the back coaches. How many people are on the train?
31. 31.A train has 133 people in the front coaches and 302 people in the back coaches. How many people are on the train?
32. 32.947 − 671 =
33. 33.405 − ? = 128
34. 34.708 + 117 =
35. 35.231 + ? = 729
36. 36.A train has 507 people in the front coaches and 456 people in the back coaches. How many people are on the train?
37. 37.? − 198 = 636
38. 38.780 − 175 =
39. 39.406 − ? = 275
40. 40.706 + ? = 935

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