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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 34 · 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. 1.480 + 430 =
  2. 2.A train has 303 people in the front coaches and 410 people in the back coaches. How many people are on the train?
  3. 3.302 − ? = 73
  4. 4.704 + 161 =
  5. 5.263 + 198 =
  6. 6.623 + 165 =
  7. 7.348 − 107 =
  8. 8.947 − 200 =
  9. 9.A school has 834 children. 604 of them are girls. How many boys are there?
  10. 10.149 + 712 =
  11. 11.? − 350 = 45
  12. 12.825 − ? = 39
  13. 13.990 − 406 =
  14. 14.A school has 666 children. 135 of them are girls. How many boys are there?
  15. 15.899 + ? = 999
  16. 16.430 + 101 =
  17. 17.A school has 200 children. 130 of them are girls. How many boys are there?
  18. 18.? + 441 = 853
  19. 19.A school has 718 children. 589 of them are girls. How many boys are there?
  20. 20.A school has 507 children. 475 of them are girls. How many boys are there?
  21. 21.A train has 640 people in the front coaches and 298 people in the back coaches. How many people are on the train?
  22. 22.251 − ? = 44
  23. 23.A train has 779 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  24. 24.229 − ? = 40
  25. 25.761 + 193 =
  26. 26.985 − 532 =
  27. 27.A school has 331 children. 176 of them are girls. How many boys are there?
  28. 28.358 + 395 =
  29. 29.A school has 502 children. 293 of them are girls. How many boys are there?
  30. 30.895 − 477 =
  31. 31.784 + ? = 953
  32. 32.A train has 630 people in the front coaches and 296 people in the back coaches. How many people are on the train?
  33. 33.828 − 114 =
  34. 34.? + 827 = 983
  35. 35.472 + 318 =
  36. 36.A school has 945 children. 143 of them are girls. How many boys are there?
  37. 37.121 + 523 =
  38. 38.A train has 362 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  39. 39.586 + ? = 808
  40. 40.? − 809 = 71

Answer key

  1. 910
  2. 713
  3. 229
  4. 865
  5. 461
  6. 788
  7. 241
  8. 747
  9. 230
  10. 861
  11. 395
  12. 786
  13. 584
  14. 531
  15. 100
  16. 531
  17. 70
  18. 412
  19. 129
  20. 32
  21. 938
  22. 207
  23. 946
  24. 189
  25. 954
  26. 453
  27. 155
  28. 753
  29. 209
  30. 418
  31. 169
  32. 926
  33. 714
  34. 156
  35. 790
  36. 802
  37. 644
  38. 515
  39. 222
  40. 880

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