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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 391 · 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. 1.669 + ? = 975
  2. 2.371 − 107 =
  3. 3.554 + ? = 983
  4. 4.A train has 560 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  5. 5.605 − 147 =
  6. 6.300 + 215 =
  7. 7.258 + 212 =
  8. 8.A train has 239 people in the front coaches and 704 people in the back coaches. How many people are on the train?
  9. 9.562 + ? = 738
  10. 10.744 − 373 =
  11. 11.914 − 199 =
  12. 12.502 − 458 =
  13. 13.? + 177 = 850
  14. 14.769 − ? = 354
  15. 15.? + 523 = 650
  16. 16.780 + ? = 994
  17. 17.713 − 596 =
  18. 18.910 − 430 =
  19. 19.727 + 107 =
  20. 20.? − 309 = 342
  21. 21.244 − 101 =
  22. 22.A train has 510 people in the front coaches and 278 people in the back coaches. How many people are on the train?
  23. 23.255 − ? = 110
  24. 24.377 + 368 =
  25. 25.A train has 202 people in the front coaches and 298 people in the back coaches. How many people are on the train?
  26. 26.A school has 406 children. 370 of them are girls. How many boys are there?
  27. 27.A train has 431 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  28. 28.A school has 461 children. 189 of them are girls. How many boys are there?
  29. 29.A school has 866 children. 825 of them are girls. How many boys are there?
  30. 30.580 + 213 =
  31. 31.463 + 461 =
  32. 32.A train has 720 people in the front coaches and 205 people in the back coaches. How many people are on the train?
  33. 33.443 + ? = 580
  34. 34.587 − ? = 233
  35. 35.? + 763 = 977
  36. 36.454 + 206 =
  37. 37.142 + 581 =
  38. 38.356 + 380 =
  39. 39.A school has 847 children. 715 of them are girls. How many boys are there?
  40. 40.A school has 238 children. 116 of them are girls. How many boys are there?

Answer key

  1. 306
  2. 264
  3. 429
  4. 822
  5. 458
  6. 515
  7. 470
  8. 943
  9. 176
  10. 371
  11. 715
  12. 44
  13. 673
  14. 415
  15. 127
  16. 214
  17. 117
  18. 480
  19. 834
  20. 651
  21. 143
  22. 788
  23. 145
  24. 745
  25. 500
  26. 36
  27. 533
  28. 272
  29. 41
  30. 793
  31. 924
  32. 925
  33. 137
  34. 354
  35. 214
  36. 660
  37. 723
  38. 736
  39. 132
  40. 122

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