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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 633 · 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. 1.382 + ? = 813
  2. 2.A train has 364 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  3. 3.747 + 129 =
  4. 4.278 + 242 =
  5. 5.588 + 131 =
  6. 6.A school has 441 children. 433 of them are girls. How many boys are there?
  7. 7.? + 219 = 592
  8. 8.539 + 164 =
  9. 9.A school has 832 children. 304 of them are girls. How many boys are there?
  10. 10.A train has 806 people in the front coaches and 158 people in the back coaches. How many people are on the train?
  11. 11.? + 824 = 977
  12. 12.? − 242 = 525
  13. 13.844 − 608 =
  14. 14.806 + 165 =
  15. 15.415 + 467 =
  16. 16.? − 759 = 1
  17. 17.A school has 870 children. 477 of them are girls. How many boys are there?
  18. 18.806 + 129 =
  19. 19.409 − 154 =
  20. 20.? − 451 = 110
  21. 21.A train has 536 people in the front coaches and 411 people in the back coaches. How many people are on the train?
  22. 22.290 − 128 =
  23. 23.A school has 542 children. 520 of them are girls. How many boys are there?
  24. 24.976 − 514 =
  25. 25.341 − 319 =
  26. 26.121 + ? = 937
  27. 27.? − 771 = 19
  28. 28.A train has 557 people in the front coaches and 215 people in the back coaches. How many people are on the train?
  29. 29.A school has 329 children. 229 of them are girls. How many boys are there?
  30. 30.514 + ? = 892
  31. 31.A train has 423 people in the front coaches and 467 people in the back coaches. How many people are on the train?
  32. 32.433 − 366 =
  33. 33.661 − ? = 124
  34. 34.456 − 291 =
  35. 35.158 + 419 =
  36. 36.710 + 130 =
  37. 37.525 − 119 =
  38. 38.549 + 320 =
  39. 39.A train has 353 people in the front coaches and 640 people in the back coaches. How many people are on the train?
  40. 40.A train has 546 people in the front coaches and 273 people in the back coaches. How many people are on the train?

Answer key

  1. 431
  2. 481
  3. 876
  4. 520
  5. 719
  6. 8
  7. 373
  8. 703
  9. 528
  10. 964
  11. 153
  12. 767
  13. 236
  14. 971
  15. 882
  16. 760
  17. 393
  18. 935
  19. 255
  20. 561
  21. 947
  22. 162
  23. 22
  24. 462
  25. 22
  26. 816
  27. 790
  28. 772
  29. 100
  30. 378
  31. 890
  32. 67
  33. 537
  34. 165
  35. 577
  36. 840
  37. 406
  38. 869
  39. 993
  40. 819

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