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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 844 · 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. 1.706 + 126 =
  2. 2.256 + 230 =
  3. 3.357 − 224 =
  4. 4.451 − 223 =
  5. 5.266 − 218 =
  6. 6.379 + 141 =
  7. 7.837 + 106 =
  8. 8.342 + 217 =
  9. 9.345 − 321 =
  10. 10.A train has 650 people in the front coaches and 200 people in the back coaches. How many people are on the train?
  11. 11.285 − 123 =
  12. 12.A train has 587 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  13. 13.A school has 537 children. 117 of them are girls. How many boys are there?
  14. 14.A school has 202 children. 129 of them are girls. How many boys are there?
  15. 15.A school has 669 children. 435 of them are girls. How many boys are there?
  16. 16.806 − 279 =
  17. 17.? + 563 = 970
  18. 18.197 + 215 =
  19. 19.A school has 280 children. 164 of them are girls. How many boys are there?
  20. 20.213 − 105 =
  21. 21.531 − 409 =
  22. 22.811 − 688 =
  23. 23.A school has 323 children. 226 of them are girls. How many boys are there?
  24. 24.357 − 291 =
  25. 25.233 − 225 =
  26. 26.A train has 679 people in the front coaches and 280 people in the back coaches. How many people are on the train?
  27. 27.A train has 851 people in the front coaches and 126 people in the back coaches. How many people are on the train?
  28. 28.180 + 618 =
  29. 29.290 + 310 =
  30. 30.359 − 125 =
  31. 31.747 + ? = 964
  32. 32.972 − ? = 668
  33. 33.575 − ? = 239
  34. 34.A school has 523 children. 254 of them are girls. How many boys are there?
  35. 35.917 − ? = 639
  36. 36.? − 319 = 308
  37. 37.418 + ? = 906
  38. 38.A train has 484 people in the front coaches and 513 people in the back coaches. How many people are on the train?
  39. 39.A train has 581 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  40. 40.251 − 165 =

Answer key

  1. 832
  2. 486
  3. 133
  4. 228
  5. 48
  6. 520
  7. 943
  8. 559
  9. 24
  10. 850
  11. 162
  12. 772
  13. 420
  14. 73
  15. 234
  16. 527
  17. 407
  18. 412
  19. 116
  20. 108
  21. 122
  22. 123
  23. 97
  24. 66
  25. 8
  26. 959
  27. 977
  28. 798
  29. 600
  30. 234
  31. 217
  32. 304
  33. 336
  34. 269
  35. 278
  36. 627
  37. 488
  38. 997
  39. 809
  40. 86

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