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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 461 · 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. 1.622 − ? = 286
  2. 2.A school has 988 children. 789 of them are girls. How many boys are there?
  3. 3.730 + 121 =
  4. 4.956 − ? = 362
  5. 5.871 − ? = 34
  6. 6.739 + ? = 948
  7. 7.989 − ? = 323
  8. 8.482 + ? = 942
  9. 9.A school has 205 children. 102 of them are girls. How many boys are there?
  10. 10.883 + 106 =
  11. 11.444 + ? = 679
  12. 12.A school has 277 children. 113 of them are girls. How many boys are there?
  13. 13.473 + 276 =
  14. 14.196 + 255 =
  15. 15.701 − 116 =
  16. 16.A school has 284 children. 280 of them are girls. How many boys are there?
  17. 17.262 − 222 =
  18. 18.A train has 669 people in the front coaches and 237 people in the back coaches. How many people are on the train?
  19. 19.169 + ? = 801
  20. 20.A school has 417 children. 288 of them are girls. How many boys are there?
  21. 21.861 − ? = 749
  22. 22.A train has 750 people in the front coaches and 169 people in the back coaches. How many people are on the train?
  23. 23.802 − 454 =
  24. 24.A school has 342 children. 281 of them are girls. How many boys are there?
  25. 25.346 + 536 =
  26. 26.? + 210 = 674
  27. 27.188 + 442 =
  28. 28.464 − ? = 226
  29. 29.870 − 253 =
  30. 30.? + 201 = 801
  31. 31.A school has 954 children. 182 of them are girls. How many boys are there?
  32. 32.213 − 129 =
  33. 33.? + 395 = 527
  34. 34.A train has 395 people in the front coaches and 445 people in the back coaches. How many people are on the train?
  35. 35.? − 263 = 106
  36. 36.A school has 632 children. 390 of them are girls. How many boys are there?
  37. 37.381 − 146 =
  38. 38.827 + 132 =
  39. 39.661 − 550 =
  40. 40.999 − ? = 817

Answer key

  1. 336
  2. 199
  3. 851
  4. 594
  5. 837
  6. 209
  7. 666
  8. 460
  9. 103
  10. 989
  11. 235
  12. 164
  13. 749
  14. 451
  15. 585
  16. 4
  17. 40
  18. 906
  19. 632
  20. 129
  21. 112
  22. 919
  23. 348
  24. 61
  25. 882
  26. 464
  27. 630
  28. 238
  29. 617
  30. 600
  31. 772
  32. 84
  33. 132
  34. 840
  35. 369
  36. 242
  37. 235
  38. 959
  39. 111
  40. 182

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