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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 830 · 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. 1.605 + 365 =
  2. 2.A school has 655 children. 528 of them are girls. How many boys are there?
  3. 3.144 + 368 =
  4. 4.280 + 288 =
  5. 5.? + 399 = 599
  6. 6.230 − 181 =
  7. 7.A train has 789 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  8. 8.A train has 513 people in the front coaches and 300 people in the back coaches. How many people are on the train?
  9. 9.799 − ? = 353
  10. 10.315 − 242 =
  11. 11.842 + ? = 994
  12. 12.A school has 398 children. 382 of them are girls. How many boys are there?
  13. 13.A train has 253 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  14. 14.A school has 462 children. 249 of them are girls. How many boys are there?
  15. 15.A train has 478 people in the front coaches and 481 people in the back coaches. How many people are on the train?
  16. 16.A train has 623 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  17. 17.655 − ? = 198
  18. 18.838 + 128 =
  19. 19.242 − 105 =
  20. 20.A train has 601 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  21. 21.100 + ? = 715
  22. 22.508 + 100 =
  23. 23.? + 550 = 668
  24. 24.215 − 138 =
  25. 25.A school has 986 children. 890 of them are girls. How many boys are there?
  26. 26.278 + ? = 608
  27. 27.A school has 885 children. 685 of them are girls. How many boys are there?
  28. 28.A train has 823 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  29. 29.718 + 266 =
  30. 30.? − 401 = 48
  31. 31.? + 411 = 617
  32. 32.580 + 204 =
  33. 33.A train has 392 people in the front coaches and 604 people in the back coaches. How many people are on the train?
  34. 34.811 + ? = 940
  35. 35.A school has 677 children. 625 of them are girls. How many boys are there?
  36. 36.682 − ? = 313
  37. 37.A school has 902 children. 155 of them are girls. How many boys are there?
  38. 38.798 + ? = 933
  39. 39.A school has 778 children. 443 of them are girls. How many boys are there?
  40. 40.241 − 130 =

Answer key

  1. 970
  2. 127
  3. 512
  4. 568
  5. 200
  6. 49
  7. 936
  8. 813
  9. 446
  10. 73
  11. 152
  12. 16
  13. 362
  14. 213
  15. 959
  16. 758
  17. 457
  18. 966
  19. 137
  20. 724
  21. 615
  22. 608
  23. 118
  24. 77
  25. 96
  26. 330
  27. 200
  28. 984
  29. 984
  30. 449
  31. 206
  32. 784
  33. 996
  34. 129
  35. 52
  36. 369
  37. 747
  38. 135
  39. 335
  40. 111

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