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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 565 · 40 sums
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.542 + ? = 742
  2. 2.446 − ? = 98
  3. 3.A school has 799 children. 576 of them are girls. How many boys are there?
  4. 4.A school has 720 children. 505 of them are girls. How many boys are there?
  5. 5.425 − ? = 150
  6. 6.A school has 305 children. 299 of them are girls. How many boys are there?
  7. 7.814 + 148 =
  8. 8.A school has 412 children. 132 of them are girls. How many boys are there?
  9. 9.A school has 410 children. 392 of them are girls. How many boys are there?
  10. 10.200 − ? = 53
  11. 11.895 + 100 =
  12. 12.447 − 300 =
  13. 13.A train has 685 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  14. 14.698 + 199 =
  15. 15.A train has 347 people in the front coaches and 549 people in the back coaches. How many people are on the train?
  16. 16.651 − ? = 473
  17. 17.A school has 275 children. 112 of them are girls. How many boys are there?
  18. 18.A school has 505 children. 388 of them are girls. How many boys are there?
  19. 19.A school has 974 children. 211 of them are girls. How many boys are there?
  20. 20.621 + ? = 785
  21. 21.? − 494 = 69
  22. 22.564 + 411 =
  23. 23.510 + 236 =
  24. 24.? − 215 = 594
  25. 25.A train has 152 people in the front coaches and 792 people in the back coaches. How many people are on the train?
  26. 26.? − 350 = 13
  27. 27.A school has 391 children. 318 of them are girls. How many boys are there?
  28. 28.? + 899 = 999
  29. 29.457 − 302 =
  30. 30.A train has 825 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  31. 31.A train has 475 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  32. 32.792 − ? = 295
  33. 33.751 − 646 =
  34. 34.390 − 362 =
  35. 35.A school has 236 children. 103 of them are girls. How many boys are there?
  36. 36.A school has 277 children. 228 of them are girls. How many boys are there?
  37. 37.? + 378 = 547
  38. 38.540 + 112 =
  39. 39.406 − 174 =
  40. 40.A train has 814 people in the front coaches and 167 people in the back coaches. How many people are on the train?

Answer key

  1. 200
  2. 348
  3. 223
  4. 215
  5. 275
  6. 6
  7. 962
  8. 280
  9. 18
  10. 147
  11. 995
  12. 147
  13. 824
  14. 897
  15. 896
  16. 178
  17. 163
  18. 117
  19. 763
  20. 164
  21. 563
  22. 975
  23. 746
  24. 809
  25. 944
  26. 363
  27. 73
  28. 100
  29. 155
  30. 977
  31. 703
  32. 497
  33. 105
  34. 28
  35. 133
  36. 49
  37. 169
  38. 652
  39. 232
  40. 981

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