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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 439 · 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. 1.296 + ? = 991
  2. 2.652 − ? = 183
  3. 3.692 + 105 =
  4. 4.? + 138 = 388
  5. 5.A train has 768 people in the front coaches and 223 people in the back coaches. How many people are on the train?
  6. 6.588 − ? = 397
  7. 7.779 − ? = 386
  8. 8.797 + 189 =
  9. 9.A school has 440 children. 308 of them are girls. How many boys are there?
  10. 10.575 + 283 =
  11. 11.994 − 519 =
  12. 12.444 − ? = 119
  13. 13.263 − 101 =
  14. 14.807 − ? = 643
  15. 15.776 − 723 =
  16. 16.765 − 284 =
  17. 17.681 − 317 =
  18. 18.186 + 182 =
  19. 19.181 + ? = 981
  20. 20.A train has 290 people in the front coaches and 667 people in the back coaches. How many people are on the train?
  21. 21.A school has 300 children. 102 of them are girls. How many boys are there?
  22. 22.672 + 258 =
  23. 23.A train has 651 people in the front coaches and 245 people in the back coaches. How many people are on the train?
  24. 24.584 − 563 =
  25. 25.523 − 129 =
  26. 26.A school has 969 children. 227 of them are girls. How many boys are there?
  27. 27.A school has 328 children. 104 of them are girls. How many boys are there?
  28. 28.296 + 434 =
  29. 29.A train has 827 people in the front coaches and 164 people in the back coaches. How many people are on the train?
  30. 30.A train has 440 people in the front coaches and 279 people in the back coaches. How many people are on the train?
  31. 31.255 − 182 =
  32. 32.A train has 108 people in the front coaches and 401 people in the back coaches. How many people are on the train?
  33. 33.? − 329 = 201
  34. 34.? + 317 = 432
  35. 35.? − 232 = 329
  36. 36.A school has 760 children. 384 of them are girls. How many boys are there?
  37. 37.275 − 146 =
  38. 38.A school has 763 children. 631 of them are girls. How many boys are there?
  39. 39.A train has 400 people in the front coaches and 371 people in the back coaches. How many people are on the train?
  40. 40.A school has 248 children. 211 of them are girls. How many boys are there?

Answer key

  1. 695
  2. 469
  3. 797
  4. 250
  5. 991
  6. 191
  7. 393
  8. 986
  9. 132
  10. 858
  11. 475
  12. 325
  13. 162
  14. 164
  15. 53
  16. 481
  17. 364
  18. 368
  19. 800
  20. 957
  21. 198
  22. 930
  23. 896
  24. 21
  25. 394
  26. 742
  27. 224
  28. 730
  29. 991
  30. 719
  31. 73
  32. 509
  33. 530
  34. 115
  35. 561
  36. 376
  37. 129
  38. 132
  39. 771
  40. 37

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