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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 305 · 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.? + 167 = 487
  2. 2.789 + 139 =
  3. 3.A train has 610 people in the front coaches and 313 people in the back coaches. How many people are on the train?
  4. 4.529 − ? = 273
  5. 5.874 − 825 =
  6. 6.A train has 442 people in the front coaches and 358 people in the back coaches. How many people are on the train?
  7. 7.412 − ? = 32
  8. 8.? + 474 = 583
  9. 9.856 − ? = 407
  10. 10.559 − ? = 236
  11. 11.A train has 538 people in the front coaches and 380 people in the back coaches. How many people are on the train?
  12. 12.515 + ? = 901
  13. 13.? − 239 = 99
  14. 14.556 − ? = 137
  15. 15.516 + ? = 631
  16. 16.A train has 282 people in the front coaches and 545 people in the back coaches. How many people are on the train?
  17. 17.651 − 448 =
  18. 18.871 − ? = 268
  19. 19.626 + ? = 942
  20. 20.266 + 489 =
  21. 21.224 − 208 =
  22. 22.? − 169 = 235
  23. 23.503 + 384 =
  24. 24.? + 425 = 766
  25. 25.A school has 206 children. 205 of them are girls. How many boys are there?
  26. 26.428 − 357 =
  27. 27.A train has 714 people in the front coaches and 138 people in the back coaches. How many people are on the train?
  28. 28.983 − ? = 186
  29. 29.662 + 285 =
  30. 30.A train has 229 people in the front coaches and 423 people in the back coaches. How many people are on the train?
  31. 31.? − 349 = 34
  32. 32.451 − 311 =
  33. 33.406 + 139 =
  34. 34.A train has 666 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  35. 35.249 − 218 =
  36. 36.A train has 200 people in the front coaches and 582 people in the back coaches. How many people are on the train?
  37. 37.593 − ? = 236
  38. 38.A train has 115 people in the front coaches and 763 people in the back coaches. How many people are on the train?
  39. 39.686 + 295 =
  40. 40.565 − 260 =

Answer key

  1. 320
  2. 928
  3. 923
  4. 256
  5. 49
  6. 800
  7. 380
  8. 109
  9. 449
  10. 323
  11. 918
  12. 386
  13. 338
  14. 419
  15. 115
  16. 827
  17. 203
  18. 603
  19. 316
  20. 755
  21. 16
  22. 404
  23. 887
  24. 341
  25. 1
  26. 71
  27. 852
  28. 797
  29. 947
  30. 652
  31. 383
  32. 140
  33. 545
  34. 802
  35. 31
  36. 782
  37. 357
  38. 878
  39. 981
  40. 305

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