Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 727 · 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 553 children. 120 of them are girls. How many boys are there?
2. 2.492 − 232 =
3. 3.225 + ? = 427
4. 4.? − 659 = 123
5. 5.383 + 259 =
6. 6.A train has 415 people in the front coaches and 143 people in the back coaches. How many people are on the train?
7. 7.A school has 832 children. 588 of them are girls. How many boys are there?
8. 8.346 + ? = 808
9. 9.A school has 219 children. 170 of them are girls. How many boys are there?
10. 10.A train has 175 people in the front coaches and 156 people in the back coaches. How many people are on the train?
11. 11.A train has 116 people in the front coaches and 527 people in the back coaches. How many people are on the train?
12. 12.107 + 679 =
13. 13.? + 351 = 685
14. 14.151 + ? = 319
15. 15.504 + 432 =
16. 16.291 + 445 =
17. 17.604 + 138 =
18. 18.376 − 361 =
19. 19.A train has 712 people in the front coaches and 266 people in the back coaches. How many people are on the train?
20. 20.A train has 236 people in the front coaches and 743 people in the back coaches. How many people are on the train?
21. 21.484 − 399 =
22. 22.A school has 480 children. 378 of them are girls. How many boys are there?
23. 23.A train has 487 people in the front coaches and 314 people in the back coaches. How many people are on the train?
24. 24.? − 350 = 120
25. 25.? + 142 = 678
26. 26.196 + 712 =
27. 27.769 + 139 =
28. 28.255 + 737 =
29. 29.721 + 137 =
30. 30.836 − 471 =
31. 31.? − 678 = 256
32. 32.A train has 475 people in the front coaches and 203 people in the back coaches. How many people are on the train?
33. 33.428 + 306 =
34. 34.622 + ? = 995
35. 35.A school has 830 children. 104 of them are girls. How many boys are there?
36. 36.447 + ? = 737
37. 37.A train has 673 people in the front coaches and 200 people in the back coaches. How many people are on the train?
38. 38.902 − ? = 696
39. 39.A train has 184 people in the front coaches and 468 people in the back coaches. How many people are on the train?
40. 40.A train has 558 people in the front coaches and 134 people in the back coaches. How many people are on the train?

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