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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 84 · 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.? + 524 = 741
  2. 2.A school has 644 children. 159 of them are girls. How many boys are there?
  3. 3.456 + 270 =
  4. 4.A school has 639 children. 241 of them are girls. How many boys are there?
  5. 5.A school has 392 children. 334 of them are girls. How many boys are there?
  6. 6.490 + 170 =
  7. 7.A school has 858 children. 810 of them are girls. How many boys are there?
  8. 8.A school has 249 children. 191 of them are girls. How many boys are there?
  9. 9.A school has 761 children. 308 of them are girls. How many boys are there?
  10. 10.858 − ? = 650
  11. 11.723 − ? = 264
  12. 12.318 − ? = 218
  13. 13.400 − 371 =
  14. 14.255 + 648 =
  15. 15.405 + 132 =
  16. 16.A school has 280 children. 110 of them are girls. How many boys are there?
  17. 17.343 + 167 =
  18. 18.319 − 175 =
  19. 19.A train has 620 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  20. 20.242 + 221 =
  21. 21.? + 167 = 273
  22. 22.428 − ? = 121
  23. 23.537 − 102 =
  24. 24.243 + 456 =
  25. 25.486 − 411 =
  26. 26.470 − 399 =
  27. 27.A school has 520 children. 277 of them are girls. How many boys are there?
  28. 28.663 + ? = 941
  29. 29.351 + 421 =
  30. 30.236 − 157 =
  31. 31.380 + 303 =
  32. 32.197 + 494 =
  33. 33.A train has 472 people in the front coaches and 354 people in the back coaches. How many people are on the train?
  34. 34.A train has 650 people in the front coaches and 252 people in the back coaches. How many people are on the train?
  35. 35.538 + 398 =
  36. 36.A train has 308 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  37. 37.? + 203 = 409
  38. 38.506 + ? = 623
  39. 39.582 − ? = 66
  40. 40.? + 252 = 943

Answer key

  1. 217
  2. 485
  3. 726
  4. 398
  5. 58
  6. 660
  7. 48
  8. 58
  9. 453
  10. 208
  11. 459
  12. 100
  13. 29
  14. 903
  15. 537
  16. 170
  17. 510
  18. 144
  19. 787
  20. 463
  21. 106
  22. 307
  23. 435
  24. 699
  25. 75
  26. 71
  27. 243
  28. 278
  29. 772
  30. 79
  31. 683
  32. 691
  33. 826
  34. 902
  35. 936
  36. 499
  37. 206
  38. 117
  39. 516
  40. 691

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