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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 849 · 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. 1.193 + 762 =
  2. 2.A school has 385 children. 186 of them are girls. How many boys are there?
  3. 3.324 − ? = 208
  4. 4.A train has 874 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  5. 5.A school has 359 children. 203 of them are girls. How many boys are there?
  6. 6.208 + 213 =
  7. 7.134 + ? = 307
  8. 8.A school has 429 children. 168 of them are girls. How many boys are there?
  9. 9.874 + ? = 987
  10. 10.A train has 448 people in the front coaches and 451 people in the back coaches. How many people are on the train?
  11. 11.350 − ? = 248
  12. 12.251 + 105 =
  13. 13.A train has 382 people in the front coaches and 313 people in the back coaches. How many people are on the train?
  14. 14.907 − 150 =
  15. 15.686 − ? = 531
  16. 16.? + 544 = 735
  17. 17.? + 495 = 996
  18. 18.850 − ? = 473
  19. 19.? + 372 = 913
  20. 20.A school has 968 children. 110 of them are girls. How many boys are there?
  21. 21.553 + 314 =
  22. 22.893 + ? = 994
  23. 23.A school has 756 children. 289 of them are girls. How many boys are there?
  24. 24.A train has 763 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  25. 25.576 − 242 =
  26. 26.294 − ? = 129
  27. 27.A school has 579 children. 454 of them are girls. How many boys are there?
  28. 28.657 − ? = 213
  29. 29.176 + ? = 816
  30. 30.317 + 219 =
  31. 31.673 − 200 =
  32. 32.535 + ? = 844
  33. 33.681 + 241 =
  34. 34.A school has 206 children. 119 of them are girls. How many boys are there?
  35. 35.A train has 623 people in the front coaches and 244 people in the back coaches. How many people are on the train?
  36. 36.200 + 108 =
  37. 37.414 + 163 =
  38. 38.727 + 196 =
  39. 39.623 − 530 =
  40. 40.732 + 170 =

Answer key

  1. 955
  2. 199
  3. 116
  4. 994
  5. 156
  6. 421
  7. 173
  8. 261
  9. 113
  10. 899
  11. 102
  12. 356
  13. 695
  14. 757
  15. 155
  16. 191
  17. 501
  18. 377
  19. 541
  20. 858
  21. 867
  22. 101
  23. 467
  24. 884
  25. 334
  26. 165
  27. 125
  28. 444
  29. 640
  30. 536
  31. 473
  32. 309
  33. 922
  34. 87
  35. 867
  36. 308
  37. 577
  38. 923
  39. 93
  40. 902

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