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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 203 · 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. 1.590 + 349 =
  2. 2.841 + 128 =
  3. 3.A school has 875 children. 526 of them are girls. How many boys are there?
  4. 4.649 + 300 =
  5. 5.? − 359 = 214
  6. 6.390 − 174 =
  7. 7.144 + 851 =
  8. 8.494 − 247 =
  9. 9.569 + ? = 697
  10. 10.A train has 787 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  11. 11.A train has 769 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  12. 12.416 + 167 =
  13. 13.615 + ? = 963
  14. 14.371 + ? = 868
  15. 15.587 + 125 =
  16. 16.418 + ? = 637
  17. 17.570 − ? = 453
  18. 18.582 − ? = 49
  19. 19.710 − ? = 604
  20. 20.A school has 941 children. 336 of them are girls. How many boys are there?
  21. 21.A school has 529 children. 136 of them are girls. How many boys are there?
  22. 22.A school has 751 children. 254 of them are girls. How many boys are there?
  23. 23.A train has 120 people in the front coaches and 514 people in the back coaches. How many people are on the train?
  24. 24.413 − 283 =
  25. 25.A school has 906 children. 748 of them are girls. How many boys are there?
  26. 26.326 + 176 =
  27. 27.A train has 374 people in the front coaches and 606 people in the back coaches. How many people are on the train?
  28. 28.A school has 659 children. 480 of them are girls. How many boys are there?
  29. 29.A school has 746 children. 519 of them are girls. How many boys are there?
  30. 30.318 + 659 =
  31. 31.A school has 596 children. 416 of them are girls. How many boys are there?
  32. 32.A school has 212 children. 168 of them are girls. How many boys are there?
  33. 33.? − 395 = 11
  34. 34.665 + 275 =
  35. 35.215 − 100 =
  36. 36.937 − 360 =
  37. 37.A school has 933 children. 930 of them are girls. How many boys are there?
  38. 38.457 − 338 =
  39. 39.409 − 163 =
  40. 40.721 − ? = 556

Answer key

  1. 939
  2. 969
  3. 349
  4. 949
  5. 573
  6. 216
  7. 995
  8. 247
  9. 128
  10. 902
  11. 971
  12. 583
  13. 348
  14. 497
  15. 712
  16. 219
  17. 117
  18. 533
  19. 106
  20. 605
  21. 393
  22. 497
  23. 634
  24. 130
  25. 158
  26. 502
  27. 980
  28. 179
  29. 227
  30. 977
  31. 180
  32. 44
  33. 406
  34. 940
  35. 115
  36. 577
  37. 3
  38. 119
  39. 246
  40. 165

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