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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 96 · 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. 1.554 + 199 =
  2. 2.627 − ? = 287
  3. 3.467 − 125 =
  4. 4.312 + 105 =
  5. 5.952 − 131 =
  6. 6.A train has 126 people in the front coaches and 169 people in the back coaches. How many people are on the train?
  7. 7.393 + 293 =
  8. 8.A school has 489 children. 225 of them are girls. How many boys are there?
  9. 9.A train has 657 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  10. 10.810 − 181 =
  11. 11.466 + 197 =
  12. 12.A school has 542 children. 182 of them are girls. How many boys are there?
  13. 13.675 + ? = 915
  14. 14.277 − 248 =
  15. 15.? − 328 = 117
  16. 16.685 + 163 =
  17. 17.586 + 132 =
  18. 18.A school has 749 children. 227 of them are girls. How many boys are there?
  19. 19.188 + ? = 928
  20. 20.808 − 397 =
  21. 21.403 − ? = 57
  22. 22.385 − ? = 207
  23. 23.? + 583 = 943
  24. 24.588 + ? = 777
  25. 25.536 + 265 =
  26. 26.859 − 744 =
  27. 27.784 + 100 =
  28. 28.172 + 140 =
  29. 29.A school has 583 children. 104 of them are girls. How many boys are there?
  30. 30.A school has 325 children. 274 of them are girls. How many boys are there?
  31. 31.A school has 539 children. 472 of them are girls. How many boys are there?
  32. 32.A school has 802 children. 624 of them are girls. How many boys are there?
  33. 33.363 + 319 =
  34. 34.937 − ? = 625
  35. 35.? − 168 = 109
  36. 36.515 − 144 =
  37. 37.808 + 107 =
  38. 38.295 − 155 =
  39. 39.A train has 225 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  40. 40.724 − 372 =

Answer key

  1. 753
  2. 340
  3. 342
  4. 417
  5. 821
  6. 295
  7. 686
  8. 264
  9. 818
  10. 629
  11. 663
  12. 360
  13. 240
  14. 29
  15. 445
  16. 848
  17. 718
  18. 522
  19. 740
  20. 411
  21. 346
  22. 178
  23. 360
  24. 189
  25. 801
  26. 115
  27. 884
  28. 312
  29. 479
  30. 51
  31. 67
  32. 178
  33. 682
  34. 312
  35. 277
  36. 371
  37. 915
  38. 140
  39. 411
  40. 352

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