Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 506 · 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. 1.603 + 258 =
2. 2.A school has 327 children. 150 of them are girls. How many boys are there?
3. 3.A school has 397 children. 170 of them are girls. How many boys are there?
4. 4.A school has 501 children. 145 of them are girls. How many boys are there?
5. 5.? − 288 = 61
6. 6.469 − 276 =
7. 7.? − 168 = 735
8. 8.285 − 130 =
9. 9.599 − ? = 256
10. 10.333 + 602 =
11. 11.? + 120 = 248
12. 12.321 + 563 =
13. 13.A train has 406 people in the front coaches and 445 people in the back coaches. How many people are on the train?
14. 14.A train has 840 people in the front coaches and 150 people in the back coaches. How many people are on the train?
15. 15.693 + ? = 859
16. 16.430 − 308 =
17. 17.437 + 375 =
18. 18.458 − 451 =
19. 19.456 + 420 =
20. 20.697 − 242 =
21. 21.927 − ? = 574
22. 22.677 − ? = 552
23. 23.? + 611 = 921
24. 24.A train has 622 people in the front coaches and 249 people in the back coaches. How many people are on the train?
25. 25.799 − ? = 666
26. 26.546 − ? = 393
27. 27.303 − ? = 154
28. 28.944 − 222 =
29. 29.247 − 104 =
30. 30.431 − 352 =
31. 31.766 − ? = 386
32. 32.371 − ? = 58
33. 33.660 − ? = 125
34. 34.336 − 292 =
35. 35.A train has 412 people in the front coaches and 586 people in the back coaches. How many people are on the train?
36. 36.866 − ? = 344
37. 37.309 − ? = 205
38. 38.A train has 150 people in the front coaches and 174 people in the back coaches. How many people are on the train?
39. 39.857 + 117 =
40. 40.259 + 319 =

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