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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 991 · 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. 1.663 + 292 =
  2. 2.251 + 144 =
  3. 3.A school has 913 children. 283 of them are girls. How many boys are there?
  4. 4.545 − 177 =
  5. 5.A school has 731 children. 681 of them are girls. How many boys are there?
  6. 6.519 − ? = 233
  7. 7.226 + 270 =
  8. 8.? + 327 = 518
  9. 9.420 + ? = 953
  10. 10.? + 747 = 934
  11. 11.724 − ? = 215
  12. 12.A train has 238 people in the front coaches and 394 people in the back coaches. How many people are on the train?
  13. 13.566 + 241 =
  14. 14.A train has 179 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  15. 15.433 − 134 =
  16. 16.A school has 315 children. 267 of them are girls. How many boys are there?
  17. 17.888 − 126 =
  18. 18.154 + ? = 562
  19. 19.634 + 312 =
  20. 20.970 − 580 =
  21. 21.414 − ? = 39
  22. 22.655 + ? = 764
  23. 23.? + 101 = 211
  24. 24.? − 297 = 22
  25. 25.A school has 876 children. 402 of them are girls. How many boys are there?
  26. 26.599 + ? = 749
  27. 27.? − 280 = 133
  28. 28.A school has 311 children. 233 of them are girls. How many boys are there?
  29. 29.252 − ? = 116
  30. 30.973 − ? = 143
  31. 31.676 + ? = 954
  32. 32.A train has 212 people in the front coaches and 159 people in the back coaches. How many people are on the train?
  33. 33.772 − 602 =
  34. 34.355 − 150 =
  35. 35.A train has 300 people in the front coaches and 637 people in the back coaches. How many people are on the train?
  36. 36.751 + ? = 896
  37. 37.283 − ? = 80
  38. 38.313 + 186 =
  39. 39.A train has 551 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  40. 40.629 + ? = 837

Answer key

  1. 955
  2. 395
  3. 630
  4. 368
  5. 50
  6. 286
  7. 496
  8. 191
  9. 533
  10. 187
  11. 509
  12. 632
  13. 807
  14. 401
  15. 299
  16. 48
  17. 762
  18. 408
  19. 946
  20. 390
  21. 375
  22. 109
  23. 110
  24. 319
  25. 474
  26. 150
  27. 413
  28. 78
  29. 136
  30. 830
  31. 278
  32. 371
  33. 170
  34. 205
  35. 937
  36. 145
  37. 203
  38. 499
  39. 690
  40. 208

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