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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 877 · 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. 1.610 + ? = 784
  2. 2.452 − 302 =
  3. 3.916 − ? = 348
  4. 4.A school has 846 children. 220 of them are girls. How many boys are there?
  5. 5.785 − ? = 597
  6. 6.? − 739 = 6
  7. 7.? − 189 = 93
  8. 8.275 + ? = 758
  9. 9.A train has 316 people in the front coaches and 366 people in the back coaches. How many people are on the train?
  10. 10.A school has 517 children. 483 of them are girls. How many boys are there?
  11. 11.? − 338 = 271
  12. 12.119 + 425 =
  13. 13.637 + 164 =
  14. 14.A school has 232 children. 117 of them are girls. How many boys are there?
  15. 15.? + 121 = 860
  16. 16.349 − ? = 48
  17. 17.684 − 267 =
  18. 18.455 − 294 =
  19. 19.A school has 950 children. 216 of them are girls. How many boys are there?
  20. 20.815 + 114 =
  21. 21.980 − ? = 617
  22. 22.? + 372 = 588
  23. 23.A school has 766 children. 590 of them are girls. How many boys are there?
  24. 24.? + 330 = 522
  25. 25.282 + 251 =
  26. 26.565 − 190 =
  27. 27.A train has 143 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  28. 28.759 − 277 =
  29. 29.369 − 325 =
  30. 30.566 + 282 =
  31. 31.A school has 326 children. 265 of them are girls. How many boys are there?
  32. 32.597 + ? = 741
  33. 33.? − 362 = 545
  34. 34.A train has 327 people in the front coaches and 288 people in the back coaches. How many people are on the train?
  35. 35.310 + 627 =
  36. 36.A school has 351 children. 224 of them are girls. How many boys are there?
  37. 37.? − 241 = 48
  38. 38.921 − 806 =
  39. 39.? + 672 = 828
  40. 40.A train has 291 people in the front coaches and 224 people in the back coaches. How many people are on the train?

Answer key

  1. 174
  2. 150
  3. 568
  4. 626
  5. 188
  6. 745
  7. 282
  8. 483
  9. 682
  10. 34
  11. 609
  12. 544
  13. 801
  14. 115
  15. 739
  16. 301
  17. 417
  18. 161
  19. 734
  20. 929
  21. 363
  22. 216
  23. 176
  24. 192
  25. 533
  26. 375
  27. 342
  28. 482
  29. 44
  30. 848
  31. 61
  32. 144
  33. 907
  34. 615
  35. 937
  36. 127
  37. 289
  38. 115
  39. 156
  40. 515

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