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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 421 · 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.? + 692 = 937
  2. 2.600 + 225 =
  3. 3.666 − 248 =
  4. 4.A train has 131 people in the front coaches and 406 people in the back coaches. How many people are on the train?
  5. 5.464 + 348 =
  6. 6.? + 757 = 929
  7. 7.A train has 335 people in the front coaches and 257 people in the back coaches. How many people are on the train?
  8. 8.A train has 121 people in the front coaches and 645 people in the back coaches. How many people are on the train?
  9. 9.? + 121 = 985
  10. 10.? − 124 = 162
  11. 11.A school has 837 children. 465 of them are girls. How many boys are there?
  12. 12.294 − 257 =
  13. 13.A train has 420 people in the front coaches and 459 people in the back coaches. How many people are on the train?
  14. 14.411 − 339 =
  15. 15.A school has 424 children. 381 of them are girls. How many boys are there?
  16. 16.? + 143 = 289
  17. 17.902 − 648 =
  18. 18.210 + 646 =
  19. 19.A train has 251 people in the front coaches and 746 people in the back coaches. How many people are on the train?
  20. 20.A train has 420 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  21. 21.255 − 135 =
  22. 22.? − 180 = 708
  23. 23.A school has 815 children. 779 of them are girls. How many boys are there?
  24. 24.338 + 441 =
  25. 25.218 − 212 =
  26. 26.755 + 170 =
  27. 27.A train has 212 people in the front coaches and 537 people in the back coaches. How many people are on the train?
  28. 28.992 − ? = 676
  29. 29.A train has 645 people in the front coaches and 319 people in the back coaches. How many people are on the train?
  30. 30.A school has 705 children. 287 of them are girls. How many boys are there?
  31. 31.A school has 423 children. 312 of them are girls. How many boys are there?
  32. 32.? − 445 = 167
  33. 33.727 − 447 =
  34. 34.363 − ? = 56
  35. 35.433 − 329 =
  36. 36.? − 437 = 487
  37. 37.561 + 387 =
  38. 38.A train has 286 people in the front coaches and 360 people in the back coaches. How many people are on the train?
  39. 39.A train has 205 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  40. 40.A train has 717 people in the front coaches and 136 people in the back coaches. How many people are on the train?

Answer key

  1. 245
  2. 825
  3. 418
  4. 537
  5. 812
  6. 172
  7. 592
  8. 766
  9. 864
  10. 286
  11. 372
  12. 37
  13. 879
  14. 72
  15. 43
  16. 146
  17. 254
  18. 856
  19. 997
  20. 591
  21. 120
  22. 888
  23. 36
  24. 779
  25. 6
  26. 925
  27. 749
  28. 316
  29. 964
  30. 418
  31. 111
  32. 612
  33. 280
  34. 307
  35. 104
  36. 924
  37. 948
  38. 646
  39. 318
  40. 853

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