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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 863 · 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. 1.919 − ? = 802
  2. 2.484 + 151 =
  3. 3.A school has 742 children. 623 of them are girls. How many boys are there?
  4. 4.496 − 492 =
  5. 5.? + 844 = 989
  6. 6.A train has 162 people in the front coaches and 556 people in the back coaches. How many people are on the train?
  7. 7.? − 181 = 193
  8. 8.783 − ? = 44
  9. 9.? + 179 = 815
  10. 10.A train has 343 people in the front coaches and 224 people in the back coaches. How many people are on the train?
  11. 11.A train has 506 people in the front coaches and 390 people in the back coaches. How many people are on the train?
  12. 12.A train has 302 people in the front coaches and 585 people in the back coaches. How many people are on the train?
  13. 13.941 − ? = 57
  14. 14.A school has 997 children. 128 of them are girls. How many boys are there?
  15. 15.A train has 218 people in the front coaches and 622 people in the back coaches. How many people are on the train?
  16. 16.? + 871 = 997
  17. 17.A school has 699 children. 375 of them are girls. How many boys are there?
  18. 18.733 − ? = 169
  19. 19.366 + 155 =
  20. 20.655 − 643 =
  21. 21.A school has 858 children. 208 of them are girls. How many boys are there?
  22. 22.? − 299 = 652
  23. 23.736 + ? = 857
  24. 24.333 + ? = 995
  25. 25.A school has 744 children. 267 of them are girls. How many boys are there?
  26. 26.A train has 220 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  27. 27.138 + 784 =
  28. 28.373 + 612 =
  29. 29.? − 291 = 188
  30. 30.363 + 618 =
  31. 31.330 − 212 =
  32. 32.410 + 370 =
  33. 33.735 + 261 =
  34. 34.A school has 779 children. 129 of them are girls. How many boys are there?
  35. 35.233 − 190 =
  36. 36.700 − ? = 288
  37. 37.A school has 412 children. 329 of them are girls. How many boys are there?
  38. 38.335 − ? = 99
  39. 39.758 + ? = 935
  40. 40.? − 113 = 603

Answer key

  1. 117
  2. 635
  3. 119
  4. 4
  5. 145
  6. 718
  7. 374
  8. 739
  9. 636
  10. 567
  11. 896
  12. 887
  13. 884
  14. 869
  15. 840
  16. 126
  17. 324
  18. 564
  19. 521
  20. 12
  21. 650
  22. 951
  23. 121
  24. 662
  25. 477
  26. 490
  27. 922
  28. 985
  29. 479
  30. 981
  31. 118
  32. 780
  33. 996
  34. 650
  35. 43
  36. 412
  37. 83
  38. 236
  39. 177
  40. 716

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