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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 413 · 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.A train has 509 people in the front coaches and 337 people in the back coaches. How many people are on the train?
  2. 2.715 − 249 =
  3. 3.A school has 266 children. 108 of them are girls. How many boys are there?
  4. 4.866 − ? = 621
  5. 5.957 − ? = 257
  6. 6.989 − 665 =
  7. 7.A train has 363 people in the front coaches and 348 people in the back coaches. How many people are on the train?
  8. 8.461 − 214 =
  9. 9.? + 809 = 967
  10. 10.206 + 114 =
  11. 11.? − 578 = 312
  12. 12.204 − 127 =
  13. 13.333 + 256 =
  14. 14.319 − 314 =
  15. 15.144 + 756 =
  16. 16.A school has 493 children. 165 of them are girls. How many boys are there?
  17. 17.? − 161 = 159
  18. 18.A school has 650 children. 268 of them are girls. How many boys are there?
  19. 19.A school has 709 children. 411 of them are girls. How many boys are there?
  20. 20.295 − ? = 133
  21. 21.475 − ? = 309
  22. 22.A train has 326 people in the front coaches and 287 people in the back coaches. How many people are on the train?
  23. 23.? − 620 = 6
  24. 24.A school has 634 children. 500 of them are girls. How many boys are there?
  25. 25.? − 239 = 525
  26. 26.715 + ? = 928
  27. 27.103 + ? = 865
  28. 28.A train has 655 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  29. 29.250 − 141 =
  30. 30.337 − ? = 26
  31. 31.730 + 177 =
  32. 32.489 + 113 =
  33. 33.622 − 372 =
  34. 34.457 + 159 =
  35. 35.565 − ? = 360
  36. 36.826 + 135 =
  37. 37.A train has 685 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  38. 38.? − 211 = 683
  39. 39.397 + 183 =
  40. 40.353 + 458 =

Answer key

  1. 846
  2. 466
  3. 158
  4. 245
  5. 700
  6. 324
  7. 711
  8. 247
  9. 158
  10. 320
  11. 890
  12. 77
  13. 589
  14. 5
  15. 900
  16. 328
  17. 320
  18. 382
  19. 298
  20. 162
  21. 166
  22. 613
  23. 626
  24. 134
  25. 764
  26. 213
  27. 762
  28. 758
  29. 109
  30. 311
  31. 907
  32. 602
  33. 250
  34. 616
  35. 205
  36. 961
  37. 951
  38. 894
  39. 580
  40. 811

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