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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 200 · 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. 1.775 + 194 =
  2. 2.? + 728 = 983
  3. 3.A school has 925 children. 423 of them are girls. How many boys are there?
  4. 4.A school has 278 children. 101 of them are girls. How many boys are there?
  5. 5.201 + 732 =
  6. 6.250 + 179 =
  7. 7.306 + 638 =
  8. 8.610 − 392 =
  9. 9.A train has 863 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  10. 10.215 + 589 =
  11. 11.100 + ? = 424
  12. 12.614 + 129 =
  13. 13.A train has 826 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  14. 14.259 + 404 =
  15. 15.? − 171 = 372
  16. 16.A train has 155 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  17. 17.757 + 242 =
  18. 18.A train has 492 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  19. 19.326 − 161 =
  20. 20.639 − 119 =
  21. 21.A train has 144 people in the front coaches and 431 people in the back coaches. How many people are on the train?
  22. 22.691 − 189 =
  23. 23.296 − 286 =
  24. 24.A school has 316 children. 125 of them are girls. How many boys are there?
  25. 25.? + 848 = 986
  26. 26.438 + 499 =
  27. 27.A train has 220 people in the front coaches and 419 people in the back coaches. How many people are on the train?
  28. 28.? + 830 = 981
  29. 29.455 − 324 =
  30. 30.? − 451 = 512
  31. 31.676 + 190 =
  32. 32.? + 325 = 842
  33. 33.244 + 688 =
  34. 34.894 + ? = 999
  35. 35.396 + 124 =
  36. 36.A train has 677 people in the front coaches and 162 people in the back coaches. How many people are on the train?
  37. 37.A school has 663 children. 473 of them are girls. How many boys are there?
  38. 38.? + 706 = 836
  39. 39.A school has 568 children. 517 of them are girls. How many boys are there?
  40. 40.A school has 329 children. 326 of them are girls. How many boys are there?

Answer key

  1. 969
  2. 255
  3. 502
  4. 177
  5. 933
  6. 429
  7. 944
  8. 218
  9. 992
  10. 804
  11. 324
  12. 743
  13. 970
  14. 663
  15. 543
  16. 305
  17. 999
  18. 668
  19. 165
  20. 520
  21. 575
  22. 502
  23. 10
  24. 191
  25. 138
  26. 937
  27. 639
  28. 151
  29. 131
  30. 963
  31. 866
  32. 517
  33. 932
  34. 105
  35. 520
  36. 839
  37. 190
  38. 130
  39. 51
  40. 3

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