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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 296 · 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. 1.393 + ? = 551
  2. 2.A train has 827 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  3. 3.386 − 376 =
  4. 4.A school has 368 children. 216 of them are girls. How many boys are there?
  5. 5.? − 126 = 134
  6. 6.A train has 201 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  7. 7.A school has 859 children. 560 of them are girls. How many boys are there?
  8. 8.832 + 107 =
  9. 9.A train has 234 people in the front coaches and 440 people in the back coaches. How many people are on the train?
  10. 10.A train has 497 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  11. 11.753 + 198 =
  12. 12.A school has 440 children. 397 of them are girls. How many boys are there?
  13. 13.460 − 409 =
  14. 14.261 + 104 =
  15. 15.? + 520 = 836
  16. 16.? + 423 = 938
  17. 17.A school has 950 children. 144 of them are girls. How many boys are there?
  18. 18.926 − ? = 298
  19. 19.496 − 205 =
  20. 20.A train has 368 people in the front coaches and 483 people in the back coaches. How many people are on the train?
  21. 21.807 + 183 =
  22. 22.A train has 248 people in the front coaches and 294 people in the back coaches. How many people are on the train?
  23. 23.803 − 487 =
  24. 24.? + 753 = 916
  25. 25.834 + 139 =
  26. 26.? + 667 = 844
  27. 27.118 + ? = 221
  28. 28.? + 420 = 591
  29. 29.685 + ? = 851
  30. 30.578 + 355 =
  31. 31.809 + ? = 959
  32. 32.A train has 386 people in the front coaches and 277 people in the back coaches. How many people are on the train?
  33. 33.800 − ? = 413
  34. 34.? + 654 = 781
  35. 35.A school has 211 children. 121 of them are girls. How many boys are there?
  36. 36.271 − 215 =
  37. 37.624 − 127 =
  38. 38.540 + ? = 909
  39. 39.886 − 165 =
  40. 40.252 − 133 =

Answer key

  1. 158
  2. 938
  3. 10
  4. 152
  5. 260
  6. 353
  7. 299
  8. 939
  9. 674
  10. 640
  11. 951
  12. 43
  13. 51
  14. 365
  15. 316
  16. 515
  17. 806
  18. 628
  19. 291
  20. 851
  21. 990
  22. 542
  23. 316
  24. 163
  25. 973
  26. 177
  27. 103
  28. 171
  29. 166
  30. 933
  31. 150
  32. 663
  33. 387
  34. 127
  35. 90
  36. 56
  37. 497
  38. 369
  39. 721
  40. 119

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