Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 911 · 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 train has 538 people in the front coaches and 237 people in the back coaches. How many people are on the train?
2. 2.885 − 884 =
3. 3.389 − ? = 115
4. 4.295 + 700 =
5. 5.223 + ? = 900
6. 6.412 − ? = 33
7. 7.A train has 616 people in the front coaches and 257 people in the back coaches. How many people are on the train?
8. 8.372 − ? = 180
9. 9.A train has 691 people in the front coaches and 217 people in the back coaches. How many people are on the train?
10. 10.? − 303 = 192
11. 11.? − 557 = 255
12. 12.A train has 367 people in the front coaches and 132 people in the back coaches. How many people are on the train?
13. 13.A school has 801 children. 271 of them are girls. How many boys are there?
14. 14.? − 257 = 27
15. 15.394 − 227 =
16. 16.A school has 755 children. 412 of them are girls. How many boys are there?
17. 17.A train has 299 people in the front coaches and 581 people in the back coaches. How many people are on the train?
18. 18.A school has 442 children. 194 of them are girls. How many boys are there?
19. 19.160 + 272 =
20. 20.960 − ? = 512
21. 21.A train has 193 people in the front coaches and 126 people in the back coaches. How many people are on the train?
22. 22.A train has 144 people in the front coaches and 397 people in the back coaches. How many people are on the train?
23. 23.301 − 107 =
24. 24.? + 110 = 860
25. 25.490 − 249 =
26. 26.A school has 484 children. 187 of them are girls. How many boys are there?
27. 27.424 − 135 =
28. 28.? − 144 = 436
29. 29.A train has 541 people in the front coaches and 164 people in the back coaches. How many people are on the train?
30. 30.306 + 294 =
31. 31.A school has 274 children. 187 of them are girls. How many boys are there?
32. 32.588 − 225 =
33. 33.? − 146 = 363
34. 34.A train has 269 people in the front coaches and 578 people in the back coaches. How many people are on the train?
35. 35.590 + 332 =
36. 36.A train has 755 people in the front coaches and 207 people in the back coaches. How many people are on the train?
37. 37.A train has 328 people in the front coaches and 124 people in the back coaches. How many people are on the train?
38. 38.772 + 211 =
39. 39.A school has 821 children. 193 of them are girls. How many boys are there?
40. 40.A train has 430 people in the front coaches and 262 people in the back coaches. How many people are on the train?

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