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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 510 · 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. 1.832 + 166 =
  2. 2.627 + 315 =
  3. 3.A train has 573 people in the front coaches and 263 people in the back coaches. How many people are on the train?
  4. 4.751 − 254 =
  5. 5.453 + 367 =
  6. 6.A train has 357 people in the front coaches and 476 people in the back coaches. How many people are on the train?
  7. 7.355 + 290 =
  8. 8.? − 223 = 6
  9. 9.454 + 356 =
  10. 10.968 − 602 =
  11. 11.483 − ? = 318
  12. 12.248 − 103 =
  13. 13.205 + 451 =
  14. 14.A train has 244 people in the front coaches and 731 people in the back coaches. How many people are on the train?
  15. 15.A train has 385 people in the front coaches and 428 people in the back coaches. How many people are on the train?
  16. 16.611 − 381 =
  17. 17.A school has 854 children. 265 of them are girls. How many boys are there?
  18. 18.371 − 207 =
  19. 19.A train has 806 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  20. 20.978 − ? = 491
  21. 21.? − 103 = 262
  22. 22.498 + 277 =
  23. 23.A school has 965 children. 265 of them are girls. How many boys are there?
  24. 24.A school has 657 children. 527 of them are girls. How many boys are there?
  25. 25.263 + 125 =
  26. 26.230 + 546 =
  27. 27.A school has 639 children. 213 of them are girls. How many boys are there?
  28. 28.? − 218 = 179
  29. 29.? − 514 = 274
  30. 30.? + 243 = 681
  31. 31.A school has 221 children. 142 of them are girls. How many boys are there?
  32. 32.A train has 178 people in the front coaches and 658 people in the back coaches. How many people are on the train?
  33. 33.A train has 285 people in the front coaches and 649 people in the back coaches. How many people are on the train?
  34. 34.316 − 159 =
  35. 35.971 − 269 =
  36. 36.745 − ? = 244
  37. 37.? + 756 = 872
  38. 38.767 − 352 =
  39. 39.217 + 573 =
  40. 40.A school has 458 children. 323 of them are girls. How many boys are there?

Answer key

  1. 998
  2. 942
  3. 836
  4. 497
  5. 820
  6. 833
  7. 645
  8. 229
  9. 810
  10. 366
  11. 165
  12. 145
  13. 656
  14. 975
  15. 813
  16. 230
  17. 589
  18. 164
  19. 947
  20. 487
  21. 365
  22. 775
  23. 700
  24. 130
  25. 388
  26. 776
  27. 426
  28. 397
  29. 788
  30. 438
  31. 79
  32. 836
  33. 934
  34. 157
  35. 702
  36. 501
  37. 116
  38. 415
  39. 790
  40. 135

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