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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 715 · 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 423 children. 151 of them are girls. How many boys are there?
  2. 2.A school has 930 children. 162 of them are girls. How many boys are there?
  3. 3.A train has 192 people in the front coaches and 302 people in the back coaches. How many people are on the train?
  4. 4.306 − ? = 206
  5. 5.713 − 318 =
  6. 6.701 − 482 =
  7. 7.249 − 139 =
  8. 8.161 + 435 =
  9. 9.480 − 105 =
  10. 10.A train has 844 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  11. 11.771 + 198 =
  12. 12.717 + 115 =
  13. 13.A train has 814 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  14. 14.844 + 141 =
  15. 15.655 + 313 =
  16. 16.? + 673 = 939
  17. 17.A school has 646 children. 105 of them are girls. How many boys are there?
  18. 18.509 − ? = 145
  19. 19.825 − 170 =
  20. 20.A school has 555 children. 472 of them are girls. How many boys are there?
  21. 21.564 − 407 =
  22. 22.436 + 197 =
  23. 23.562 + ? = 740
  24. 24.A school has 926 children. 506 of them are girls. How many boys are there?
  25. 25.956 − 932 =
  26. 26.A train has 626 people in the front coaches and 364 people in the back coaches. How many people are on the train?
  27. 27.A school has 954 children. 215 of them are girls. How many boys are there?
  28. 28.332 + 322 =
  29. 29.A school has 825 children. 457 of them are girls. How many boys are there?
  30. 30.758 − 424 =
  31. 31.A school has 331 children. 232 of them are girls. How many boys are there?
  32. 32.938 − ? = 537
  33. 33.584 + 374 =
  34. 34.391 − 185 =
  35. 35.? − 285 = 642
  36. 36.887 − ? = 621
  37. 37.A train has 763 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  38. 38.618 − 445 =
  39. 39.623 − 462 =
  40. 40.469 + ? = 869

Answer key

  1. 272
  2. 768
  3. 494
  4. 100
  5. 395
  6. 219
  7. 110
  8. 596
  9. 375
  10. 959
  11. 969
  12. 832
  13. 967
  14. 985
  15. 968
  16. 266
  17. 541
  18. 364
  19. 655
  20. 83
  21. 157
  22. 633
  23. 178
  24. 420
  25. 24
  26. 990
  27. 739
  28. 654
  29. 368
  30. 334
  31. 99
  32. 401
  33. 958
  34. 206
  35. 927
  36. 266
  37. 880
  38. 173
  39. 161
  40. 400

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