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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 9 · 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. 1.611 − 301 =
  2. 2.A train has 763 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  3. 3.892 + 103 =
  4. 4.726 + 242 =
  5. 5.793 − 255 =
  6. 6.652 + 269 =
  7. 7.? − 449 = 168
  8. 8.390 − 173 =
  9. 9.555 − ? = 377
  10. 10.A school has 301 children. 126 of them are girls. How many boys are there?
  11. 11.343 − 111 =
  12. 12.436 − 367 =
  13. 13.A train has 782 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  14. 14.A train has 710 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  15. 15.237 − 119 =
  16. 16.709 + 270 =
  17. 17.657 + 310 =
  18. 18.A school has 769 children. 645 of them are girls. How many boys are there?
  19. 19.421 − 221 =
  20. 20.? − 430 = 167
  21. 21.479 + 334 =
  22. 22.718 − ? = 277
  23. 23.? − 130 = 272
  24. 24.358 − 351 =
  25. 25.536 − 240 =
  26. 26.? + 359 = 534
  27. 27.A school has 631 children. 528 of them are girls. How many boys are there?
  28. 28.831 + ? = 998
  29. 29.? + 359 = 668
  30. 30.297 + ? = 626
  31. 31.565 + 279 =
  32. 32.934 − 808 =
  33. 33.A train has 847 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  34. 34.A school has 956 children. 381 of them are girls. How many boys are there?
  35. 35.A school has 690 children. 681 of them are girls. How many boys are there?
  36. 36.270 + 434 =
  37. 37.320 + ? = 440
  38. 38.A school has 658 children. 325 of them are girls. How many boys are there?
  39. 39.536 − 328 =
  40. 40.A school has 395 children. 165 of them are girls. How many boys are there?

Answer key

  1. 310
  2. 952
  3. 995
  4. 968
  5. 538
  6. 921
  7. 617
  8. 217
  9. 178
  10. 175
  11. 232
  12. 69
  13. 967
  14. 896
  15. 118
  16. 979
  17. 967
  18. 124
  19. 200
  20. 597
  21. 813
  22. 441
  23. 402
  24. 7
  25. 296
  26. 175
  27. 103
  28. 167
  29. 309
  30. 329
  31. 844
  32. 126
  33. 984
  34. 575
  35. 9
  36. 704
  37. 120
  38. 333
  39. 208
  40. 230

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