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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 576 · 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. 1.836 − 297 =
  2. 2.385 − 188 =
  3. 3.805 − ? = 165
  4. 4.145 + 589 =
  5. 5.393 − ? = 25
  6. 6.? − 400 = 380
  7. 7.A train has 279 people in the front coaches and 519 people in the back coaches. How many people are on the train?
  8. 8.A school has 299 children. 273 of them are girls. How many boys are there?
  9. 9.788 + ? = 916
  10. 10.A train has 344 people in the front coaches and 647 people in the back coaches. How many people are on the train?
  11. 11.751 − 117 =
  12. 12.? − 217 = 294
  13. 13.? − 116 = 92
  14. 14.? + 158 = 555
  15. 15.508 − 117 =
  16. 16.A school has 720 children. 124 of them are girls. How many boys are there?
  17. 17.813 − 144 =
  18. 18.210 + ? = 581
  19. 19.A train has 632 people in the front coaches and 362 people in the back coaches. How many people are on the train?
  20. 20.A train has 876 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  21. 21.A school has 427 children. 227 of them are girls. How many boys are there?
  22. 22.478 − 195 =
  23. 23.196 + ? = 866
  24. 24.A train has 536 people in the front coaches and 217 people in the back coaches. How many people are on the train?
  25. 25.? + 297 = 450
  26. 26.952 − 871 =
  27. 27.? − 112 = 220
  28. 28.? − 157 = 279
  29. 29.A school has 633 children. 630 of them are girls. How many boys are there?
  30. 30.144 + ? = 758
  31. 31.A train has 316 people in the front coaches and 522 people in the back coaches. How many people are on the train?
  32. 32.? + 554 = 790
  33. 33.102 + 144 =
  34. 34.A school has 733 children. 138 of them are girls. How many boys are there?
  35. 35.? + 131 = 509
  36. 36.259 + 492 =
  37. 37.181 + 663 =
  38. 38.275 + ? = 542
  39. 39.399 − 350 =
  40. 40.244 + ? = 555

Answer key

  1. 539
  2. 197
  3. 640
  4. 734
  5. 368
  6. 780
  7. 798
  8. 26
  9. 128
  10. 991
  11. 634
  12. 511
  13. 208
  14. 397
  15. 391
  16. 596
  17. 669
  18. 371
  19. 994
  20. 993
  21. 200
  22. 283
  23. 670
  24. 753
  25. 153
  26. 81
  27. 332
  28. 436
  29. 3
  30. 614
  31. 838
  32. 236
  33. 246
  34. 595
  35. 378
  36. 751
  37. 844
  38. 267
  39. 49
  40. 311

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