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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 521 · 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. 1.491 + 464 =
  2. 2.? + 299 = 489
  3. 3.110 + 105 =
  4. 4.342 + ? = 487
  5. 5.473 + 231 =
  6. 6.A train has 533 people in the front coaches and 417 people in the back coaches. How many people are on the train?
  7. 7.284 + ? = 865
  8. 8.A train has 531 people in the front coaches and 390 people in the back coaches. How many people are on the train?
  9. 9.578 + 193 =
  10. 10.141 + 214 =
  11. 11.371 + 280 =
  12. 12.130 + 850 =
  13. 13.155 + 810 =
  14. 14.842 − 206 =
  15. 15.341 − ? = 231
  16. 16.487 + 453 =
  17. 17.A train has 381 people in the front coaches and 159 people in the back coaches. How many people are on the train?
  18. 18.845 − 622 =
  19. 19.608 + 386 =
  20. 20.773 + 150 =
  21. 21.212 + 488 =
  22. 22.313 + ? = 500
  23. 23.? + 150 = 590
  24. 24.? − 606 = 220
  25. 25.655 − 590 =
  26. 26.? + 747 = 954
  27. 27.A train has 569 people in the front coaches and 209 people in the back coaches. How many people are on the train?
  28. 28.A train has 682 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  29. 29.? + 838 = 993
  30. 30.A school has 551 children. 225 of them are girls. How many boys are there?
  31. 31.592 − ? = 22
  32. 32.? + 402 = 832
  33. 33.A school has 647 children. 500 of them are girls. How many boys are there?
  34. 34.579 + 132 =
  35. 35.A train has 514 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  36. 36.480 + 102 =
  37. 37.939 − 646 =
  38. 38.A school has 332 children. 299 of them are girls. How many boys are there?
  39. 39.246 + ? = 945
  40. 40.554 − 173 =

Answer key

  1. 955
  2. 190
  3. 215
  4. 145
  5. 704
  6. 950
  7. 581
  8. 921
  9. 771
  10. 355
  11. 651
  12. 980
  13. 965
  14. 636
  15. 110
  16. 940
  17. 540
  18. 223
  19. 994
  20. 923
  21. 700
  22. 187
  23. 440
  24. 826
  25. 65
  26. 207
  27. 778
  28. 937
  29. 155
  30. 326
  31. 570
  32. 430
  33. 147
  34. 711
  35. 617
  36. 582
  37. 293
  38. 33
  39. 699
  40. 381

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