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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 347 · 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. 1.215 + 328 =
  2. 2.829 − 472 =
  3. 3.? + 150 = 260
  4. 4.A school has 982 children. 883 of them are girls. How many boys are there?
  5. 5.924 − 191 =
  6. 6.A school has 655 children. 438 of them are girls. How many boys are there?
  7. 7.A school has 735 children. 451 of them are girls. How many boys are there?
  8. 8.577 − ? = 125
  9. 9.451 + 306 =
  10. 10.? + 471 = 594
  11. 11.181 + 725 =
  12. 12.A school has 386 children. 299 of them are girls. How many boys are there?
  13. 13.241 − 230 =
  14. 14.632 − ? = 282
  15. 15.752 − 224 =
  16. 16.A train has 801 people in the front coaches and 194 people in the back coaches. How many people are on the train?
  17. 17.857 − ? = 82
  18. 18.? + 513 = 981
  19. 19.? − 132 = 101
  20. 20.851 − 267 =
  21. 21.A school has 319 children. 260 of them are girls. How many boys are there?
  22. 22.A train has 410 people in the front coaches and 328 people in the back coaches. How many people are on the train?
  23. 23.685 − 651 =
  24. 24.? + 325 = 477
  25. 25.916 − 157 =
  26. 26.A train has 470 people in the front coaches and 263 people in the back coaches. How many people are on the train?
  27. 27.126 + 447 =
  28. 28.217 − ? = 74
  29. 29.548 + 135 =
  30. 30.274 − ? = 129
  31. 31.? + 123 = 984
  32. 32.? + 279 = 693
  33. 33.? + 496 = 619
  34. 34.A train has 173 people in the front coaches and 256 people in the back coaches. How many people are on the train?
  35. 35.? + 515 = 630
  36. 36.A train has 124 people in the front coaches and 243 people in the back coaches. How many people are on the train?
  37. 37.729 − 488 =
  38. 38.330 − 247 =
  39. 39.818 − 311 =
  40. 40.369 − ? = 152

Answer key

  1. 543
  2. 357
  3. 110
  4. 99
  5. 733
  6. 217
  7. 284
  8. 452
  9. 757
  10. 123
  11. 906
  12. 87
  13. 11
  14. 350
  15. 528
  16. 995
  17. 775
  18. 468
  19. 233
  20. 584
  21. 59
  22. 738
  23. 34
  24. 152
  25. 759
  26. 733
  27. 573
  28. 143
  29. 683
  30. 145
  31. 861
  32. 414
  33. 123
  34. 429
  35. 115
  36. 367
  37. 241
  38. 83
  39. 507
  40. 217

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