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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 580 · 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.? + 886 = 990
  2. 2.317 + 150 =
  3. 3.436 + 306 =
  4. 4.338 + ? = 778
  5. 5.569 + 154 =
  6. 6.726 + 231 =
  7. 7.A train has 654 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  8. 8.646 − 619 =
  9. 9.? + 229 = 714
  10. 10.A train has 267 people in the front coaches and 575 people in the back coaches. How many people are on the train?
  11. 11.773 + 165 =
  12. 12.A train has 319 people in the front coaches and 338 people in the back coaches. How many people are on the train?
  13. 13.? − 275 = 449
  14. 14.? − 307 = 242
  15. 15.378 − 241 =
  16. 16.? + 547 = 997
  17. 17.505 − 130 =
  18. 18.119 + 582 =
  19. 19.719 + ? = 854
  20. 20.120 + ? = 717
  21. 21.A school has 268 children. 207 of them are girls. How many boys are there?
  22. 22.752 − 689 =
  23. 23.788 + ? = 946
  24. 24.837 − ? = 512
  25. 25.195 + ? = 414
  26. 26.129 + ? = 251
  27. 27.442 + ? = 906
  28. 28.750 + 232 =
  29. 29.265 + 437 =
  30. 30.? + 121 = 342
  31. 31.A train has 740 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  32. 32.337 − ? = 60
  33. 33.A school has 378 children. 274 of them are girls. How many boys are there?
  34. 34.A school has 315 children. 134 of them are girls. How many boys are there?
  35. 35.A school has 712 children. 507 of them are girls. How many boys are there?
  36. 36.A school has 597 children. 467 of them are girls. How many boys are there?
  37. 37.A school has 426 children. 137 of them are girls. How many boys are there?
  38. 38.589 + 347 =
  39. 39.A train has 864 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  40. 40.748 + 194 =

Answer key

  1. 104
  2. 467
  3. 742
  4. 440
  5. 723
  6. 957
  7. 835
  8. 27
  9. 485
  10. 842
  11. 938
  12. 657
  13. 724
  14. 549
  15. 137
  16. 450
  17. 375
  18. 701
  19. 135
  20. 597
  21. 61
  22. 63
  23. 158
  24. 325
  25. 219
  26. 122
  27. 464
  28. 982
  29. 702
  30. 221
  31. 865
  32. 277
  33. 104
  34. 181
  35. 205
  36. 130
  37. 289
  38. 936
  39. 973
  40. 942

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