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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 361 · 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. 1.662 − ? = 103
  2. 2.608 + 188 =
  3. 3.A train has 262 people in the front coaches and 321 people in the back coaches. How many people are on the train?
  4. 4.423 + 208 =
  5. 5.? − 170 = 162
  6. 6.A school has 987 children. 237 of them are girls. How many boys are there?
  7. 7.? − 315 = 177
  8. 8.785 − 608 =
  9. 9.809 − 764 =
  10. 10.A school has 509 children. 156 of them are girls. How many boys are there?
  11. 11.620 + 255 =
  12. 12.A train has 386 people in the front coaches and 248 people in the back coaches. How many people are on the train?
  13. 13.402 + 366 =
  14. 14.A school has 435 children. 240 of them are girls. How many boys are there?
  15. 15.752 + 135 =
  16. 16.? + 540 = 901
  17. 17.608 − ? = 219
  18. 18.641 − 378 =
  19. 19.? − 109 = 409
  20. 20.? − 186 = 214
  21. 21.385 − 120 =
  22. 22.? + 509 = 708
  23. 23.A school has 253 children. 234 of them are girls. How many boys are there?
  24. 24.? + 444 = 984
  25. 25.632 − ? = 274
  26. 26.834 + 120 =
  27. 27.402 − 305 =
  28. 28.A school has 820 children. 241 of them are girls. How many boys are there?
  29. 29.780 − 166 =
  30. 30.A train has 200 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  31. 31.? + 131 = 730
  32. 32.A train has 427 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  33. 33.? + 863 = 963
  34. 34.? − 158 = 248
  35. 35.791 + 175 =
  36. 36.? − 400 = 144
  37. 37.? − 211 = 272
  38. 38.410 + 431 =
  39. 39.? + 578 = 882
  40. 40.A school has 786 children. 240 of them are girls. How many boys are there?

Answer key

  1. 559
  2. 796
  3. 583
  4. 631
  5. 332
  6. 750
  7. 492
  8. 177
  9. 45
  10. 353
  11. 875
  12. 634
  13. 768
  14. 195
  15. 887
  16. 361
  17. 389
  18. 263
  19. 518
  20. 400
  21. 265
  22. 199
  23. 19
  24. 540
  25. 358
  26. 954
  27. 97
  28. 579
  29. 614
  30. 422
  31. 599
  32. 558
  33. 100
  34. 406
  35. 966
  36. 544
  37. 483
  38. 841
  39. 304
  40. 546

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