Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 406 · 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.A school has 912 children. 301 of them are girls. How many boys are there?
2. 2.A train has 423 people in the front coaches and 417 people in the back coaches. How many people are on the train?
3. 3.A train has 867 people in the front coaches and 126 people in the back coaches. How many people are on the train?
4. 4.789 + 181 =
5. 5.524 − 222 =
6. 6.A train has 822 people in the front coaches and 165 people in the back coaches. How many people are on the train?
7. 7.A school has 841 children. 787 of them are girls. How many boys are there?
8. 8.258 + 200 =
9. 9.893 − ? = 11
10. 10.A train has 103 people in the front coaches and 462 people in the back coaches. How many people are on the train?
11. 11.945 − ? = 410
12. 12.292 + ? = 792
13. 13.781 − 271 =
14. 14.A train has 128 people in the front coaches and 253 people in the back coaches. How many people are on the train?
15. 15.A train has 444 people in the front coaches and 425 people in the back coaches. How many people are on the train?
16. 16.A school has 581 children. 218 of them are girls. How many boys are there?
17. 17.479 − 173 =
18. 18.814 + ? = 926
19. 19.A train has 345 people in the front coaches and 644 people in the back coaches. How many people are on the train?
20. 20.? + 758 = 875
21. 21.355 + 462 =
22. 22.152 + 720 =
23. 23.? + 683 = 911
24. 24.336 − 191 =
25. 25.A train has 489 people in the front coaches and 113 people in the back coaches. How many people are on the train?
26. 26.647 − 603 =
27. 27.732 + 171 =
28. 28.428 − 156 =
29. 29.A train has 275 people in the front coaches and 704 people in the back coaches. How many people are on the train?
30. 30.A train has 839 people in the front coaches and 141 people in the back coaches. How many people are on the train?
31. 31.? + 158 = 543
32. 32.A school has 641 children. 175 of them are girls. How many boys are there?
33. 33.223 + 763 =
34. 34.? − 538 = 157
35. 35.? + 217 = 572
36. 36.528 + ? = 832
37. 37.374 + 611 =
38. 38.958 − 178 =
39. 39.A school has 351 children. 192 of them are girls. How many boys are there?
40. 40.A train has 345 people in the front coaches and 399 people in the back coaches. How many people are on the train?

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