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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 225 · 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.? − 239 = 302
  2. 2.557 − 513 =
  3. 3.945 − ? = 207
  4. 4.838 − ? = 511
  5. 5.902 − 685 =
  6. 6.451 + 469 =
  7. 7.457 + ? = 879
  8. 8.? + 113 = 711
  9. 9.243 − ? = 5
  10. 10.? − 118 = 84
  11. 11.A train has 897 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  12. 12.A school has 253 children. 166 of them are girls. How many boys are there?
  13. 13.667 − 542 =
  14. 14.273 + 715 =
  15. 15.697 − 506 =
  16. 16.A school has 241 children. 126 of them are girls. How many boys are there?
  17. 17.501 − 132 =
  18. 18.A school has 415 children. 242 of them are girls. How many boys are there?
  19. 19.A train has 328 people in the front coaches and 357 people in the back coaches. How many people are on the train?
  20. 20.A school has 892 children. 844 of them are girls. How many boys are there?
  21. 21.374 + 489 =
  22. 22.453 + 109 =
  23. 23.A school has 523 children. 497 of them are girls. How many boys are there?
  24. 24.736 − ? = 257
  25. 25.A train has 323 people in the front coaches and 488 people in the back coaches. How many people are on the train?
  26. 26.A train has 641 people in the front coaches and 303 people in the back coaches. How many people are on the train?
  27. 27.698 + 194 =
  28. 28.? + 544 = 858
  29. 29.A school has 628 children. 247 of them are girls. How many boys are there?
  30. 30.? + 237 = 453
  31. 31.475 + 125 =
  32. 32.700 − ? = 138
  33. 33.416 − 180 =
  34. 34.? + 383 = 657
  35. 35.648 − 364 =
  36. 36.504 − 486 =
  37. 37.A school has 763 children. 117 of them are girls. How many boys are there?
  38. 38.394 − 342 =
  39. 39.A school has 521 children. 185 of them are girls. How many boys are there?
  40. 40.259 + 601 =

Answer key

  1. 541
  2. 44
  3. 738
  4. 327
  5. 217
  6. 920
  7. 422
  8. 598
  9. 238
  10. 202
  11. 998
  12. 87
  13. 125
  14. 988
  15. 191
  16. 115
  17. 369
  18. 173
  19. 685
  20. 48
  21. 863
  22. 562
  23. 26
  24. 479
  25. 811
  26. 944
  27. 892
  28. 314
  29. 381
  30. 216
  31. 600
  32. 562
  33. 236
  34. 274
  35. 284
  36. 18
  37. 646
  38. 52
  39. 336
  40. 860

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