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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 712 · 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. 1.157 + ? = 454
  2. 2.A school has 333 children. 254 of them are girls. How many boys are there?
  3. 3.A train has 566 people in the front coaches and 284 people in the back coaches. How many people are on the train?
  4. 4.939 − ? = 603
  5. 5.438 − 302 =
  6. 6.A train has 888 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  7. 7.? − 200 = 127
  8. 8.736 + ? = 945
  9. 9.307 − 116 =
  10. 10.580 − 165 =
  11. 11.A school has 402 children. 298 of them are girls. How many boys are there?
  12. 12.? + 525 = 630
  13. 13.392 − 171 =
  14. 14.535 + 398 =
  15. 15.687 − ? = 445
  16. 16.? + 669 = 876
  17. 17.A school has 954 children. 696 of them are girls. How many boys are there?
  18. 18.299 + ? = 817
  19. 19.194 + ? = 731
  20. 20.894 + 104 =
  21. 21.? − 619 = 10
  22. 22.? − 325 = 557
  23. 23.450 + 319 =
  24. 24.? − 232 = 733
  25. 25.505 − ? = 105
  26. 26.345 − 104 =
  27. 27.345 − 167 =
  28. 28.? + 685 = 889
  29. 29.A school has 253 children. 110 of them are girls. How many boys are there?
  30. 30.987 − ? = 160
  31. 31.991 − ? = 600
  32. 32.A train has 131 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  33. 33.A train has 611 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  34. 34.935 − ? = 198
  35. 35.A school has 656 children. 579 of them are girls. How many boys are there?
  36. 36.A train has 588 people in the front coaches and 307 people in the back coaches. How many people are on the train?
  37. 37.805 + 108 =
  38. 38.410 + ? = 808
  39. 39.A train has 805 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  40. 40.285 + 293 =

Answer key

  1. 297
  2. 79
  3. 850
  4. 336
  5. 136
  6. 995
  7. 327
  8. 209
  9. 191
  10. 415
  11. 104
  12. 105
  13. 221
  14. 933
  15. 242
  16. 207
  17. 258
  18. 518
  19. 537
  20. 998
  21. 629
  22. 882
  23. 769
  24. 965
  25. 400
  26. 241
  27. 178
  28. 204
  29. 143
  30. 827
  31. 391
  32. 280
  33. 725
  34. 737
  35. 77
  36. 895
  37. 913
  38. 398
  39. 914
  40. 578

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