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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 362 · 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. 1.898 − 114 =
  2. 2.? + 292 = 898
  3. 3.? + 734 = 949
  4. 4.A school has 523 children. 347 of them are girls. How many boys are there?
  5. 5.277 − 234 =
  6. 6.? − 102 = 552
  7. 7.361 − 308 =
  8. 8.A school has 410 children. 395 of them are girls. How many boys are there?
  9. 9.? − 127 = 312
  10. 10.A train has 705 people in the front coaches and 175 people in the back coaches. How many people are on the train?
  11. 11.499 − 252 =
  12. 12.? + 421 = 531
  13. 13.? − 140 = 146
  14. 14.A train has 424 people in the front coaches and 235 people in the back coaches. How many people are on the train?
  15. 15.253 − 184 =
  16. 16.A school has 280 children. 147 of them are girls. How many boys are there?
  17. 17.372 − ? = 22
  18. 18.A school has 206 children. 129 of them are girls. How many boys are there?
  19. 19.? + 583 = 989
  20. 20.859 − 521 =
  21. 21.449 − 324 =
  22. 22.241 + 238 =
  23. 23.518 − 471 =
  24. 24.158 + 436 =
  25. 25.346 − ? = 159
  26. 26.A train has 152 people in the front coaches and 589 people in the back coaches. How many people are on the train?
  27. 27.A train has 633 people in the front coaches and 207 people in the back coaches. How many people are on the train?
  28. 28.? + 637 = 828
  29. 29.A school has 412 children. 167 of them are girls. How many boys are there?
  30. 30.657 − 252 =
  31. 31.322 + 647 =
  32. 32.A train has 462 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  33. 33.A school has 533 children. 177 of them are girls. How many boys are there?
  34. 34.A school has 371 children. 321 of them are girls. How many boys are there?
  35. 35.? + 302 = 514
  36. 36.A school has 809 children. 802 of them are girls. How many boys are there?
  37. 37.184 + 361 =
  38. 38.393 + ? = 796
  39. 39.718 + 125 =
  40. 40.389 + ? = 672

Answer key

  1. 784
  2. 606
  3. 215
  4. 176
  5. 43
  6. 654
  7. 53
  8. 15
  9. 439
  10. 880
  11. 247
  12. 110
  13. 286
  14. 659
  15. 69
  16. 133
  17. 350
  18. 77
  19. 406
  20. 338
  21. 125
  22. 479
  23. 47
  24. 594
  25. 187
  26. 741
  27. 840
  28. 191
  29. 245
  30. 405
  31. 969
  32. 642
  33. 356
  34. 50
  35. 212
  36. 7
  37. 545
  38. 403
  39. 843
  40. 283

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