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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 79 · 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. 1.546 + 114 =
  2. 2.252 + 207 =
  3. 3.A school has 642 children. 341 of them are girls. How many boys are there?
  4. 4.567 − 112 =
  5. 5.A school has 313 children. 120 of them are girls. How many boys are there?
  6. 6.? + 816 = 954
  7. 7.831 + 101 =
  8. 8.537 − 532 =
  9. 9.276 + ? = 381
  10. 10.A school has 312 children. 157 of them are girls. How many boys are there?
  11. 11.A school has 993 children. 960 of them are girls. How many boys are there?
  12. 12.? + 256 = 555
  13. 13.334 + 650 =
  14. 14.993 − ? = 429
  15. 15.656 + ? = 930
  16. 16.A train has 857 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  17. 17.A school has 282 children. 221 of them are girls. How many boys are there?
  18. 18.A school has 853 children. 244 of them are girls. How many boys are there?
  19. 19.786 − 678 =
  20. 20.A school has 797 children. 361 of them are girls. How many boys are there?
  21. 21.836 + 138 =
  22. 22.A school has 935 children. 322 of them are girls. How many boys are there?
  23. 23.537 − 343 =
  24. 24.A school has 864 children. 312 of them are girls. How many boys are there?
  25. 25.777 + 138 =
  26. 26.? + 701 = 881
  27. 27.A train has 449 people in the front coaches and 414 people in the back coaches. How many people are on the train?
  28. 28.A school has 413 children. 101 of them are girls. How many boys are there?
  29. 29.A train has 300 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  30. 30.A school has 766 children. 151 of them are girls. How many boys are there?
  31. 31.457 + 530 =
  32. 32.441 − ? = 41
  33. 33.689 − 589 =
  34. 34.182 + 815 =
  35. 35.660 − 166 =
  36. 36.A train has 389 people in the front coaches and 429 people in the back coaches. How many people are on the train?
  37. 37.295 + 311 =
  38. 38.A train has 475 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  39. 39.530 − ? = 229
  40. 40.? + 325 = 580

Answer key

  1. 660
  2. 459
  3. 301
  4. 455
  5. 193
  6. 138
  7. 932
  8. 5
  9. 105
  10. 155
  11. 33
  12. 299
  13. 984
  14. 564
  15. 274
  16. 993
  17. 61
  18. 609
  19. 108
  20. 436
  21. 974
  22. 613
  23. 194
  24. 552
  25. 915
  26. 180
  27. 863
  28. 312
  29. 450
  30. 615
  31. 987
  32. 400
  33. 100
  34. 997
  35. 494
  36. 818
  37. 606
  38. 582
  39. 301
  40. 255

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