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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 585 · 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. 1.387 − 324 =
  2. 2.138 + 231 =
  3. 3.? + 575 = 999
  4. 4.A school has 403 children. 236 of them are girls. How many boys are there?
  5. 5.166 + ? = 678
  6. 6.440 + 351 =
  7. 7.478 + 470 =
  8. 8.629 − 245 =
  9. 9.A school has 559 children. 553 of them are girls. How many boys are there?
  10. 10.? + 566 = 741
  11. 11.A school has 668 children. 611 of them are girls. How many boys are there?
  12. 12.? + 164 = 850
  13. 13.? + 885 = 989
  14. 14.? + 888 = 988
  15. 15.? − 112 = 373
  16. 16.? − 117 = 594
  17. 17.267 + 644 =
  18. 18.314 + 647 =
  19. 19.969 − ? = 6
  20. 20.A train has 216 people in the front coaches and 172 people in the back coaches. How many people are on the train?
  21. 21.A school has 351 children. 306 of them are girls. How many boys are there?
  22. 22.782 + 149 =
  23. 23.737 + 106 =
  24. 24.? − 249 = 173
  25. 25.A train has 669 people in the front coaches and 164 people in the back coaches. How many people are on the train?
  26. 26.313 + 334 =
  27. 27.390 + 596 =
  28. 28.A train has 705 people in the front coaches and 243 people in the back coaches. How many people are on the train?
  29. 29.827 − ? = 158
  30. 30.285 + 267 =
  31. 31.369 − ? = 186
  32. 32.A school has 636 children. 503 of them are girls. How many boys are there?
  33. 33.261 − ? = 137
  34. 34.713 + 114 =
  35. 35.A train has 664 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  36. 36.? − 278 = 707
  37. 37.A train has 361 people in the front coaches and 488 people in the back coaches. How many people are on the train?
  38. 38.A school has 228 children. 150 of them are girls. How many boys are there?
  39. 39.449 − ? = 87
  40. 40.A school has 763 children. 718 of them are girls. How many boys are there?

Answer key

  1. 63
  2. 369
  3. 424
  4. 167
  5. 512
  6. 791
  7. 948
  8. 384
  9. 6
  10. 175
  11. 57
  12. 686
  13. 104
  14. 100
  15. 485
  16. 711
  17. 911
  18. 961
  19. 963
  20. 388
  21. 45
  22. 931
  23. 843
  24. 422
  25. 833
  26. 647
  27. 986
  28. 948
  29. 669
  30. 552
  31. 183
  32. 133
  33. 124
  34. 827
  35. 865
  36. 985
  37. 849
  38. 78
  39. 362
  40. 45

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