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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 700 · 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. 1.572 + 166 =
  2. 2.A train has 389 people in the front coaches and 275 people in the back coaches. How many people are on the train?
  3. 3.A train has 511 people in the front coaches and 369 people in the back coaches. How many people are on the train?
  4. 4.A school has 243 children. 216 of them are girls. How many boys are there?
  5. 5.A train has 543 people in the front coaches and 410 people in the back coaches. How many people are on the train?
  6. 6.373 − 341 =
  7. 7.768 − 501 =
  8. 8.888 − 225 =
  9. 9.103 + 244 =
  10. 10.A train has 130 people in the front coaches and 159 people in the back coaches. How many people are on the train?
  11. 11.A train has 413 people in the front coaches and 481 people in the back coaches. How many people are on the train?
  12. 12.693 + 118 =
  13. 13.213 − 168 =
  14. 14.293 + ? = 748
  15. 15.417 − 242 =
  16. 16.727 + ? = 835
  17. 17.911 − 832 =
  18. 18.985 − ? = 253
  19. 19.? − 119 = 109
  20. 20.A school has 676 children. 177 of them are girls. How many boys are there?
  21. 21.486 + 438 =
  22. 22.? + 513 = 648
  23. 23.206 + 543 =
  24. 24.? − 412 = 13
  25. 25.468 − 195 =
  26. 26.702 − 603 =
  27. 27.290 − 104 =
  28. 28.? + 125 = 442
  29. 29.A school has 311 children. 133 of them are girls. How many boys are there?
  30. 30.688 + 191 =
  31. 31.814 − 341 =
  32. 32.? − 197 = 96
  33. 33.A school has 880 children. 455 of them are girls. How many boys are there?
  34. 34.745 − ? = 608
  35. 35.477 + 449 =
  36. 36.A train has 291 people in the front coaches and 614 people in the back coaches. How many people are on the train?
  37. 37.908 − 225 =
  38. 38.440 − 404 =
  39. 39.365 − ? = 17
  40. 40.306 + ? = 898

Answer key

  1. 738
  2. 664
  3. 880
  4. 27
  5. 953
  6. 32
  7. 267
  8. 663
  9. 347
  10. 289
  11. 894
  12. 811
  13. 45
  14. 455
  15. 175
  16. 108
  17. 79
  18. 732
  19. 228
  20. 499
  21. 924
  22. 135
  23. 749
  24. 425
  25. 273
  26. 99
  27. 186
  28. 317
  29. 178
  30. 879
  31. 473
  32. 293
  33. 425
  34. 137
  35. 926
  36. 905
  37. 683
  38. 36
  39. 348
  40. 592

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