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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 637 · 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.A train has 160 people in the front coaches and 633 people in the back coaches. How many people are on the train?
  2. 2.A train has 133 people in the front coaches and 795 people in the back coaches. How many people are on the train?
  3. 3.341 − ? = 73
  4. 4.479 + 122 =
  5. 5.296 − 193 =
  6. 6.484 − 280 =
  7. 7.A school has 243 children. 174 of them are girls. How many boys are there?
  8. 8.215 − 102 =
  9. 9.? + 685 = 978
  10. 10.? + 279 = 650
  11. 11.A school has 253 children. 142 of them are girls. How many boys are there?
  12. 12.A school has 409 children. 403 of them are girls. How many boys are there?
  13. 13.? − 603 = 69
  14. 14.A train has 409 people in the front coaches and 486 people in the back coaches. How many people are on the train?
  15. 15.911 − 188 =
  16. 16.929 − 711 =
  17. 17.560 − 138 =
  18. 18.A train has 162 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  19. 19.A school has 611 children. 102 of them are girls. How many boys are there?
  20. 20.742 + ? = 879
  21. 21.A school has 954 children. 205 of them are girls. How many boys are there?
  22. 22.? + 334 = 789
  23. 23.250 − 114 =
  24. 24.734 + ? = 999
  25. 25.300 − ? = 181
  26. 26.482 + ? = 911
  27. 27.A school has 811 children. 597 of them are girls. How many boys are there?
  28. 28.A school has 926 children. 168 of them are girls. How many boys are there?
  29. 29.? − 130 = 108
  30. 30.? − 101 = 371
  31. 31.A school has 702 children. 619 of them are girls. How many boys are there?
  32. 32.? − 238 = 756
  33. 33.? + 821 = 931
  34. 34.? − 235 = 114
  35. 35.727 + 161 =
  36. 36.A school has 885 children. 203 of them are girls. How many boys are there?
  37. 37.756 − 504 =
  38. 38.564 + ? = 880
  39. 39.236 − ? = 124
  40. 40.451 + 331 =

Answer key

  1. 793
  2. 928
  3. 268
  4. 601
  5. 103
  6. 204
  7. 69
  8. 113
  9. 293
  10. 371
  11. 111
  12. 6
  13. 672
  14. 895
  15. 723
  16. 218
  17. 422
  18. 282
  19. 509
  20. 137
  21. 749
  22. 455
  23. 136
  24. 265
  25. 119
  26. 429
  27. 214
  28. 758
  29. 238
  30. 472
  31. 83
  32. 994
  33. 110
  34. 349
  35. 888
  36. 682
  37. 252
  38. 316
  39. 112
  40. 782

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