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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 335 · 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.A school has 350 children. 349 of them are girls. How many boys are there?
  2. 2.858 + 114 =
  3. 3.737 + ? = 944
  4. 4.? + 117 = 894
  5. 5.299 + 231 =
  6. 6.A school has 570 children. 155 of them are girls. How many boys are there?
  7. 7.745 − 650 =
  8. 8.756 + 180 =
  9. 9.154 + ? = 311
  10. 10.? + 765 = 914
  11. 11.348 + 605 =
  12. 12.? − 128 = 202
  13. 13.? + 297 = 945
  14. 14.924 − ? = 425
  15. 15.? + 280 = 926
  16. 16.781 + ? = 931
  17. 17.A school has 811 children. 779 of them are girls. How many boys are there?
  18. 18.? + 368 = 945
  19. 19.747 + ? = 989
  20. 20.213 − 112 =
  21. 21.A school has 635 children. 585 of them are girls. How many boys are there?
  22. 22.A train has 330 people in the front coaches and 326 people in the back coaches. How many people are on the train?
  23. 23.642 + ? = 777
  24. 24.A train has 268 people in the front coaches and 554 people in the back coaches. How many people are on the train?
  25. 25.A train has 471 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  26. 26.A school has 467 children. 170 of them are girls. How many boys are there?
  27. 27.? + 487 = 651
  28. 28.404 − 110 =
  29. 29.A school has 383 children. 156 of them are girls. How many boys are there?
  30. 30.A train has 833 people in the front coaches and 138 people in the back coaches. How many people are on the train?
  31. 31.548 − 214 =
  32. 32.A school has 999 children. 387 of them are girls. How many boys are there?
  33. 33.391 + 531 =
  34. 34.798 − ? = 603
  35. 35.A train has 351 people in the front coaches and 352 people in the back coaches. How many people are on the train?
  36. 36.555 + ? = 667
  37. 37.112 + 419 =
  38. 38.331 − 222 =
  39. 39.? − 222 = 413
  40. 40.690 + 214 =

Answer key

  1. 1
  2. 972
  3. 207
  4. 777
  5. 530
  6. 415
  7. 95
  8. 936
  9. 157
  10. 149
  11. 953
  12. 330
  13. 648
  14. 499
  15. 646
  16. 150
  17. 32
  18. 577
  19. 242
  20. 101
  21. 50
  22. 656
  23. 135
  24. 822
  25. 841
  26. 297
  27. 164
  28. 294
  29. 227
  30. 971
  31. 334
  32. 612
  33. 922
  34. 195
  35. 703
  36. 112
  37. 531
  38. 109
  39. 635
  40. 904

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