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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 476 · 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. 1.434 + ? = 534
  2. 2.? + 215 = 835
  3. 3.873 − 663 =
  4. 4.A train has 285 people in the front coaches and 590 people in the back coaches. How many people are on the train?
  5. 5.695 − 476 =
  6. 6.? + 213 = 412
  7. 7.569 − 402 =
  8. 8.407 − 278 =
  9. 9.309 + 406 =
  10. 10.441 − 409 =
  11. 11.A school has 232 children. 123 of them are girls. How many boys are there?
  12. 12.247 − ? = 82
  13. 13.A school has 309 children. 159 of them are girls. How many boys are there?
  14. 14.A school has 872 children. 679 of them are girls. How many boys are there?
  15. 15.259 + 434 =
  16. 16.A school has 660 children. 442 of them are girls. How many boys are there?
  17. 17.A school has 368 children. 132 of them are girls. How many boys are there?
  18. 18.A train has 296 people in the front coaches and 439 people in the back coaches. How many people are on the train?
  19. 19.? + 368 = 642
  20. 20.? − 577 = 41
  21. 21.? + 537 = 870
  22. 22.499 − ? = 61
  23. 23.? − 432 = 284
  24. 24.A school has 497 children. 346 of them are girls. How many boys are there?
  25. 25.686 + 246 =
  26. 26.A train has 437 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  27. 27.434 + 151 =
  28. 28.A school has 235 children. 128 of them are girls. How many boys are there?
  29. 29.A train has 246 people in the front coaches and 252 people in the back coaches. How many people are on the train?
  30. 30.391 + 316 =
  31. 31.884 + 103 =
  32. 32.149 + 712 =
  33. 33.873 − 132 =
  34. 34.285 − 200 =
  35. 35.872 + 117 =
  36. 36.? − 198 = 232
  37. 37.324 + 415 =
  38. 38.253 + ? = 546
  39. 39.A school has 201 children. 110 of them are girls. How many boys are there?
  40. 40.? + 462 = 562

Answer key

  1. 100
  2. 620
  3. 210
  4. 875
  5. 219
  6. 199
  7. 167
  8. 129
  9. 715
  10. 32
  11. 109
  12. 165
  13. 150
  14. 193
  15. 693
  16. 218
  17. 236
  18. 735
  19. 274
  20. 618
  21. 333
  22. 438
  23. 716
  24. 151
  25. 932
  26. 570
  27. 585
  28. 107
  29. 498
  30. 707
  31. 987
  32. 861
  33. 741
  34. 85
  35. 989
  36. 430
  37. 739
  38. 293
  39. 91
  40. 100

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