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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 915 · 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.A train has 362 people in the front coaches and 345 people in the back coaches. How many people are on the train?
  2. 2.468 + 410 =
  3. 3.A train has 767 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  4. 4.A train has 837 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  5. 5.A school has 695 children. 260 of them are girls. How many boys are there?
  6. 6.A school has 635 children. 148 of them are girls. How many boys are there?
  7. 7.281 + 275 =
  8. 8.? + 394 = 803
  9. 9.701 + ? = 995
  10. 10.428 − 401 =
  11. 11.732 − ? = 457
  12. 12.897 − 241 =
  13. 13.950 − 813 =
  14. 14.712 − 465 =
  15. 15.710 − 384 =
  16. 16.521 + 280 =
  17. 17.874 − 134 =
  18. 18.366 − ? = 237
  19. 19.791 − 139 =
  20. 20.369 − ? = 66
  21. 21.414 − 121 =
  22. 22.A train has 528 people in the front coaches and 332 people in the back coaches. How many people are on the train?
  23. 23.? − 117 = 250
  24. 24.543 + ? = 752
  25. 25.A train has 131 people in the front coaches and 233 people in the back coaches. How many people are on the train?
  26. 26.466 − 208 =
  27. 27.974 − 743 =
  28. 28.902 − 570 =
  29. 29.790 − 271 =
  30. 30.A school has 214 children. 164 of them are girls. How many boys are there?
  31. 31.264 − 251 =
  32. 32.? + 647 = 843
  33. 33.A train has 522 people in the front coaches and 453 people in the back coaches. How many people are on the train?
  34. 34.A train has 727 people in the front coaches and 134 people in the back coaches. How many people are on the train?
  35. 35.136 + 310 =
  36. 36.? − 308 = 248
  37. 37.A school has 519 children. 224 of them are girls. How many boys are there?
  38. 38.718 + ? = 883
  39. 39.778 + 184 =
  40. 40.461 − 220 =

Answer key

  1. 707
  2. 878
  3. 914
  4. 938
  5. 435
  6. 487
  7. 556
  8. 409
  9. 294
  10. 27
  11. 275
  12. 656
  13. 137
  14. 247
  15. 326
  16. 801
  17. 740
  18. 129
  19. 652
  20. 303
  21. 293
  22. 860
  23. 367
  24. 209
  25. 364
  26. 258
  27. 231
  28. 332
  29. 519
  30. 50
  31. 13
  32. 196
  33. 975
  34. 861
  35. 446
  36. 556
  37. 295
  38. 165
  39. 962
  40. 241

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