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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 204 · 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. 1.122 + 349 =
  2. 2.815 − ? = 639
  3. 3.452 + 323 =
  4. 4.? + 444 = 579
  5. 5.A school has 598 children. 472 of them are girls. How many boys are there?
  6. 6.A school has 422 children. 278 of them are girls. How many boys are there?
  7. 7.461 + 488 =
  8. 8.189 + 498 =
  9. 9.204 + ? = 830
  10. 10.393 − 285 =
  11. 11.A school has 421 children. 248 of them are girls. How many boys are there?
  12. 12.392 − 255 =
  13. 13.454 + 515 =
  14. 14.A school has 375 children. 279 of them are girls. How many boys are there?
  15. 15.443 + 120 =
  16. 16.A school has 906 children. 892 of them are girls. How many boys are there?
  17. 17.451 − 426 =
  18. 18.658 − ? = 457
  19. 19.862 − 789 =
  20. 20.789 − 249 =
  21. 21.366 + 574 =
  22. 22.A train has 507 people in the front coaches and 373 people in the back coaches. How many people are on the train?
  23. 23.253 + ? = 645
  24. 24.285 − ? = 173
  25. 25.603 + 138 =
  26. 26.760 − ? = 225
  27. 27.A school has 325 children. 119 of them are girls. How many boys are there?
  28. 28.A school has 997 children. 512 of them are girls. How many boys are there?
  29. 29.360 + 231 =
  30. 30.131 + 672 =
  31. 31.768 − 522 =
  32. 32.A school has 399 children. 263 of them are girls. How many boys are there?
  33. 33.? + 240 = 698
  34. 34.A school has 572 children. 452 of them are girls. How many boys are there?
  35. 35.573 + 269 =
  36. 36.277 − 105 =
  37. 37.893 − ? = 89
  38. 38.201 − ? = 44
  39. 39.854 + ? = 983
  40. 40.A train has 692 people in the front coaches and 253 people in the back coaches. How many people are on the train?

Answer key

  1. 471
  2. 176
  3. 775
  4. 135
  5. 126
  6. 144
  7. 949
  8. 687
  9. 626
  10. 108
  11. 173
  12. 137
  13. 969
  14. 96
  15. 563
  16. 14
  17. 25
  18. 201
  19. 73
  20. 540
  21. 940
  22. 880
  23. 392
  24. 112
  25. 741
  26. 535
  27. 206
  28. 485
  29. 591
  30. 803
  31. 246
  32. 136
  33. 458
  34. 120
  35. 842
  36. 172
  37. 804
  38. 157
  39. 129
  40. 945

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