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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 311 · 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.? − 161 = 114
  2. 2.259 − ? = 145
  3. 3.? − 315 = 223
  4. 4.583 + 277 =
  5. 5.952 − 544 =
  6. 6.A train has 431 people in the front coaches and 288 people in the back coaches. How many people are on the train?
  7. 7.A train has 238 people in the front coaches and 430 people in the back coaches. How many people are on the train?
  8. 8.? − 201 = 98
  9. 9.A train has 364 people in the front coaches and 503 people in the back coaches. How many people are on the train?
  10. 10.? − 128 = 515
  11. 11.269 − 144 =
  12. 12.374 − 309 =
  13. 13.? − 161 = 154
  14. 14.? + 688 = 807
  15. 15.333 + 630 =
  16. 16.282 − 168 =
  17. 17.A school has 740 children. 412 of them are girls. How many boys are there?
  18. 18.406 − ? = 140
  19. 19.242 + 490 =
  20. 20.899 + 100 =
  21. 21.655 + ? = 979
  22. 22.A train has 209 people in the front coaches and 357 people in the back coaches. How many people are on the train?
  23. 23.A school has 444 children. 355 of them are girls. How many boys are there?
  24. 24.? + 266 = 584
  25. 25.527 + 242 =
  26. 26.A school has 756 children. 183 of them are girls. How many boys are there?
  27. 27.? − 117 = 564
  28. 28.632 − ? = 420
  29. 29.A school has 543 children. 465 of them are girls. How many boys are there?
  30. 30.652 − ? = 248
  31. 31.A train has 714 people in the front coaches and 179 people in the back coaches. How many people are on the train?
  32. 32.? + 474 = 932
  33. 33.A train has 359 people in the front coaches and 592 people in the back coaches. How many people are on the train?
  34. 34.A school has 966 children. 264 of them are girls. How many boys are there?
  35. 35.? − 184 = 69
  36. 36.400 − ? = 138
  37. 37.? − 109 = 176
  38. 38.? − 275 = 443
  39. 39.383 + ? = 685
  40. 40.? − 240 = 2

Answer key

  1. 275
  2. 114
  3. 538
  4. 860
  5. 408
  6. 719
  7. 668
  8. 299
  9. 867
  10. 643
  11. 125
  12. 65
  13. 315
  14. 119
  15. 963
  16. 114
  17. 328
  18. 266
  19. 732
  20. 999
  21. 324
  22. 566
  23. 89
  24. 318
  25. 769
  26. 573
  27. 681
  28. 212
  29. 78
  30. 404
  31. 893
  32. 458
  33. 951
  34. 702
  35. 253
  36. 262
  37. 285
  38. 718
  39. 302
  40. 242

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