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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 21 · 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.A school has 332 children. 258 of them are girls. How many boys are there?
  2. 2.452 − 251 =
  3. 3.866 − 410 =
  4. 4.A school has 760 children. 310 of them are girls. How many boys are there?
  5. 5.? + 496 = 917
  6. 6.? + 678 = 853
  7. 7.420 + ? = 730
  8. 8.A school has 508 children. 180 of them are girls. How many boys are there?
  9. 9.? − 311 = 39
  10. 10.443 + ? = 968
  11. 11.211 + 760 =
  12. 12.904 − 642 =
  13. 13.729 − ? = 186
  14. 14.? + 260 = 569
  15. 15.584 + 249 =
  16. 16.A school has 742 children. 430 of them are girls. How many boys are there?
  17. 17.899 + 100 =
  18. 18.357 − 152 =
  19. 19.188 + 449 =
  20. 20.249 + 358 =
  21. 21.699 + ? = 931
  22. 22.A train has 607 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  23. 23.A train has 247 people in the front coaches and 733 people in the back coaches. How many people are on the train?
  24. 24.154 + ? = 471
  25. 25.A train has 128 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  26. 26.818 − 258 =
  27. 27.854 − 572 =
  28. 28.385 + 398 =
  29. 29.233 − 156 =
  30. 30.727 + ? = 889
  31. 31.? − 348 = 54
  32. 32.A train has 554 people in the front coaches and 285 people in the back coaches. How many people are on the train?
  33. 33.639 − ? = 343
  34. 34.833 − 307 =
  35. 35.? − 714 = 138
  36. 36.476 + 173 =
  37. 37.496 + ? = 793
  38. 38.A school has 352 children. 109 of them are girls. How many boys are there?
  39. 39.? − 193 = 48
  40. 40.A train has 221 people in the front coaches and 337 people in the back coaches. How many people are on the train?

Answer key

  1. 74
  2. 201
  3. 456
  4. 450
  5. 421
  6. 175
  7. 310
  8. 328
  9. 350
  10. 525
  11. 971
  12. 262
  13. 543
  14. 309
  15. 833
  16. 312
  17. 999
  18. 205
  19. 637
  20. 607
  21. 232
  22. 740
  23. 980
  24. 317
  25. 265
  26. 560
  27. 282
  28. 783
  29. 77
  30. 162
  31. 402
  32. 839
  33. 296
  34. 526
  35. 852
  36. 649
  37. 297
  38. 243
  39. 241
  40. 558

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