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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 752 · 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 school has 929 children. 719 of them are girls. How many boys are there?
  2. 2.? + 521 = 824
  3. 3.A train has 620 people in the front coaches and 196 people in the back coaches. How many people are on the train?
  4. 4.A train has 750 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  5. 5.A school has 634 children. 265 of them are girls. How many boys are there?
  6. 6.A train has 434 people in the front coaches and 194 people in the back coaches. How many people are on the train?
  7. 7.775 + 155 =
  8. 8.242 − ? = 13
  9. 9.736 − 319 =
  10. 10.822 − 244 =
  11. 11.846 − 109 =
  12. 12.? − 392 = 126
  13. 13.293 − ? = 88
  14. 14.402 − 313 =
  15. 15.241 + ? = 969
  16. 16.341 − 154 =
  17. 17.413 + 561 =
  18. 18.696 + ? = 850
  19. 19.757 + 124 =
  20. 20.A train has 519 people in the front coaches and 305 people in the back coaches. How many people are on the train?
  21. 21.496 − ? = 356
  22. 22.701 + 200 =
  23. 23.303 − 183 =
  24. 24.771 + 181 =
  25. 25.? + 397 = 632
  26. 26.115 + 631 =
  27. 27.417 − 101 =
  28. 28.275 − ? = 46
  29. 29.742 + 250 =
  30. 30.? + 180 = 791
  31. 31.670 + ? = 950
  32. 32.A school has 940 children. 809 of them are girls. How many boys are there?
  33. 33.A train has 548 people in the front coaches and 274 people in the back coaches. How many people are on the train?
  34. 34.708 + 162 =
  35. 35.A train has 311 people in the front coaches and 626 people in the back coaches. How many people are on the train?
  36. 36.639 − 397 =
  37. 37.214 − 205 =
  38. 38.461 − 341 =
  39. 39.388 − ? = 286
  40. 40.A school has 981 children. 312 of them are girls. How many boys are there?

Answer key

  1. 210
  2. 303
  3. 816
  4. 887
  5. 369
  6. 628
  7. 930
  8. 229
  9. 417
  10. 578
  11. 737
  12. 518
  13. 205
  14. 89
  15. 728
  16. 187
  17. 974
  18. 154
  19. 881
  20. 824
  21. 140
  22. 901
  23. 120
  24. 952
  25. 235
  26. 746
  27. 316
  28. 229
  29. 992
  30. 611
  31. 280
  32. 131
  33. 822
  34. 870
  35. 937
  36. 242
  37. 9
  38. 120
  39. 102
  40. 669

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