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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 796 · 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. 1.605 − 240 =
  2. 2.952 − ? = 216
  3. 3.412 − 157 =
  4. 4.244 + 129 =
  5. 5.936 − 366 =
  6. 6.701 + ? = 838
  7. 7.193 + 646 =
  8. 8.A train has 515 people in the front coaches and 325 people in the back coaches. How many people are on the train?
  9. 9.734 + 164 =
  10. 10.853 + 121 =
  11. 11.520 + ? = 962
  12. 12.? − 145 = 743
  13. 13.468 + ? = 849
  14. 14.287 − 263 =
  15. 15.? + 155 = 678
  16. 16.282 − ? = 158
  17. 17.800 + 110 =
  18. 18.438 + ? = 914
  19. 19.897 − 664 =
  20. 20.415 + 115 =
  21. 21.276 + 279 =
  22. 22.965 − 560 =
  23. 23.? + 633 = 912
  24. 24.? − 900 = 3
  25. 25.? − 216 = 565
  26. 26.648 + 142 =
  27. 27.108 + 704 =
  28. 28.460 − 131 =
  29. 29.A train has 367 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  30. 30.375 − 196 =
  31. 31.A train has 792 people in the front coaches and 165 people in the back coaches. How many people are on the train?
  32. 32.? − 188 = 61
  33. 33.A school has 798 children. 157 of them are girls. How many boys are there?
  34. 34.573 + ? = 785
  35. 35.A school has 599 children. 373 of them are girls. How many boys are there?
  36. 36.A school has 349 children. 171 of them are girls. How many boys are there?
  37. 37.584 − ? = 228
  38. 38.A train has 290 people in the front coaches and 698 people in the back coaches. How many people are on the train?
  39. 39.A train has 833 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  40. 40.A train has 370 people in the front coaches and 274 people in the back coaches. How many people are on the train?

Answer key

  1. 365
  2. 736
  3. 255
  4. 373
  5. 570
  6. 137
  7. 839
  8. 840
  9. 898
  10. 974
  11. 442
  12. 888
  13. 381
  14. 24
  15. 523
  16. 124
  17. 910
  18. 476
  19. 233
  20. 530
  21. 555
  22. 405
  23. 279
  24. 903
  25. 781
  26. 790
  27. 812
  28. 329
  29. 492
  30. 179
  31. 957
  32. 249
  33. 641
  34. 212
  35. 226
  36. 178
  37. 356
  38. 988
  39. 943
  40. 644

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