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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 976 · 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.? − 370 = 314
  2. 2.238 − 140 =
  3. 3.? − 109 = 544
  4. 4.359 − 166 =
  5. 5.A school has 737 children. 457 of them are girls. How many boys are there?
  6. 6.? + 129 = 832
  7. 7.261 − 101 =
  8. 8.540 − 222 =
  9. 9.972 − 207 =
  10. 10.? − 239 = 716
  11. 11.A school has 880 children. 580 of them are girls. How many boys are there?
  12. 12.? + 243 = 458
  13. 13.? − 578 = 35
  14. 14.? + 782 = 915
  15. 15.? + 204 = 553
  16. 16.A school has 265 children. 206 of them are girls. How many boys are there?
  17. 17.A school has 910 children. 249 of them are girls. How many boys are there?
  18. 18.769 + ? = 920
  19. 19.A train has 224 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  20. 20.301 + 623 =
  21. 21.A train has 183 people in the front coaches and 767 people in the back coaches. How many people are on the train?
  22. 22.? − 155 = 746
  23. 23.A train has 476 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  24. 24.A school has 448 children. 343 of them are girls. How many boys are there?
  25. 25.231 + 599 =
  26. 26.A train has 504 people in the front coaches and 281 people in the back coaches. How many people are on the train?
  27. 27.745 − 349 =
  28. 28.409 + 539 =
  29. 29.A train has 716 people in the front coaches and 259 people in the back coaches. How many people are on the train?
  30. 30.180 + 178 =
  31. 31.121 + 264 =
  32. 32.435 − 317 =
  33. 33.212 − 121 =
  34. 34.326 + 357 =
  35. 35.825 + ? = 947
  36. 36.846 − ? = 534
  37. 37.328 − 292 =
  38. 38.497 − 282 =
  39. 39.A school has 454 children. 101 of them are girls. How many boys are there?
  40. 40.548 + 210 =

Answer key

  1. 684
  2. 98
  3. 653
  4. 193
  5. 280
  6. 703
  7. 160
  8. 318
  9. 765
  10. 955
  11. 300
  12. 215
  13. 613
  14. 133
  15. 349
  16. 59
  17. 661
  18. 151
  19. 353
  20. 924
  21. 950
  22. 901
  23. 590
  24. 105
  25. 830
  26. 785
  27. 396
  28. 948
  29. 975
  30. 358
  31. 385
  32. 118
  33. 91
  34. 683
  35. 122
  36. 312
  37. 36
  38. 215
  39. 353
  40. 758

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