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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 857 · 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. 1.764 + 171 =
  2. 2.A train has 313 people in the front coaches and 491 people in the back coaches. How many people are on the train?
  3. 3.430 − 312 =
  4. 4.A school has 566 children. 474 of them are girls. How many boys are there?
  5. 5.A school has 759 children. 542 of them are girls. How many boys are there?
  6. 6.A train has 488 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  7. 7.? − 356 = 335
  8. 8.A school has 232 children. 117 of them are girls. How many boys are there?
  9. 9.A school has 762 children. 161 of them are girls. How many boys are there?
  10. 10.A train has 244 people in the front coaches and 555 people in the back coaches. How many people are on the train?
  11. 11.A school has 388 children. 111 of them are girls. How many boys are there?
  12. 12.303 − 154 =
  13. 13.471 − ? = 51
  14. 14.A train has 353 people in the front coaches and 416 people in the back coaches. How many people are on the train?
  15. 15.A train has 367 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  16. 16.A school has 891 children. 160 of them are girls. How many boys are there?
  17. 17.177 + 134 =
  18. 18.A school has 581 children. 563 of them are girls. How many boys are there?
  19. 19.129 + 794 =
  20. 20.A train has 632 people in the front coaches and 238 people in the back coaches. How many people are on the train?
  21. 21.? − 301 = 535
  22. 22.845 + 107 =
  23. 23.A train has 457 people in the front coaches and 536 people in the back coaches. How many people are on the train?
  24. 24.A school has 730 children. 221 of them are girls. How many boys are there?
  25. 25.? − 276 = 67
  26. 26.? + 322 = 783
  27. 27.432 + 529 =
  28. 28.890 − ? = 636
  29. 29.287 − ? = 63
  30. 30.? + 453 = 712
  31. 31.432 + 426 =
  32. 32.A school has 821 children. 281 of them are girls. How many boys are there?
  33. 33.698 − ? = 220
  34. 34.179 + 342 =
  35. 35.? − 176 = 127
  36. 36.A school has 322 children. 277 of them are girls. How many boys are there?
  37. 37.625 − 320 =
  38. 38.A train has 289 people in the front coaches and 565 people in the back coaches. How many people are on the train?
  39. 39.A school has 491 children. 214 of them are girls. How many boys are there?
  40. 40.151 + ? = 306

Answer key

  1. 935
  2. 804
  3. 118
  4. 92
  5. 217
  6. 613
  7. 691
  8. 115
  9. 601
  10. 799
  11. 277
  12. 149
  13. 420
  14. 769
  15. 534
  16. 731
  17. 311
  18. 18
  19. 923
  20. 870
  21. 836
  22. 952
  23. 993
  24. 509
  25. 343
  26. 461
  27. 961
  28. 254
  29. 224
  30. 259
  31. 858
  32. 540
  33. 478
  34. 521
  35. 303
  36. 45
  37. 305
  38. 854
  39. 277
  40. 155

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