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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 889 · 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 328 people in the front coaches and 409 people in the back coaches. How many people are on the train?
  2. 2.566 − ? = 352
  3. 3.304 − ? = 167
  4. 4.514 + 469 =
  5. 5.? + 665 = 782
  6. 6.? − 426 = 137
  7. 7.864 + 126 =
  8. 8.A school has 665 children. 458 of them are girls. How many boys are there?
  9. 9.A train has 387 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  10. 10.? − 130 = 619
  11. 11.564 + 233 =
  12. 12.838 + 129 =
  13. 13.473 − ? = 80
  14. 14.? + 233 = 746
  15. 15.A train has 250 people in the front coaches and 249 people in the back coaches. How many people are on the train?
  16. 16.? − 172 = 321
  17. 17.A train has 710 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  18. 18.? + 648 = 844
  19. 19.A school has 889 children. 503 of them are girls. How many boys are there?
  20. 20.698 − ? = 473
  21. 21.894 + ? = 994
  22. 22.435 − 417 =
  23. 23.410 − 149 =
  24. 24.947 − 563 =
  25. 25.356 − ? = 6
  26. 26.A school has 834 children. 634 of them are girls. How many boys are there?
  27. 27.? − 811 = 79
  28. 28.A school has 305 children. 165 of them are girls. How many boys are there?
  29. 29.721 + 174 =
  30. 30.824 − 303 =
  31. 31.353 + 575 =
  32. 32.899 − 753 =
  33. 33.546 − 516 =
  34. 34.A train has 218 people in the front coaches and 565 people in the back coaches. How many people are on the train?
  35. 35.278 − ? = 22
  36. 36.A train has 147 people in the front coaches and 745 people in the back coaches. How many people are on the train?
  37. 37.325 − 119 =
  38. 38.A school has 313 children. 186 of them are girls. How many boys are there?
  39. 39.? − 369 = 238
  40. 40.222 − 116 =

Answer key

  1. 737
  2. 214
  3. 137
  4. 983
  5. 117
  6. 563
  7. 990
  8. 207
  9. 517
  10. 749
  11. 797
  12. 967
  13. 393
  14. 513
  15. 499
  16. 493
  17. 834
  18. 196
  19. 386
  20. 225
  21. 100
  22. 18
  23. 261
  24. 384
  25. 350
  26. 200
  27. 890
  28. 140
  29. 895
  30. 521
  31. 928
  32. 146
  33. 30
  34. 783
  35. 256
  36. 892
  37. 206
  38. 127
  39. 607
  40. 106

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