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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 888 · 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 school has 382 children. 194 of them are girls. How many boys are there?
  2. 2.? − 137 = 87
  3. 3.943 − 728 =
  4. 4.A school has 530 children. 242 of them are girls. How many boys are there?
  5. 5.584 − ? = 324
  6. 6.A school has 225 children. 199 of them are girls. How many boys are there?
  7. 7.A school has 334 children. 106 of them are girls. How many boys are there?
  8. 8.? + 722 = 846
  9. 9.A school has 643 children. 180 of them are girls. How many boys are there?
  10. 10.A school has 308 children. 236 of them are girls. How many boys are there?
  11. 11.136 + 595 =
  12. 12.A school has 489 children. 146 of them are girls. How many boys are there?
  13. 13.A train has 523 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  14. 14.A train has 326 people in the front coaches and 246 people in the back coaches. How many people are on the train?
  15. 15.? + 826 = 997
  16. 16.A school has 343 children. 287 of them are girls. How many boys are there?
  17. 17.546 − 135 =
  18. 18.421 − 401 =
  19. 19.218 − 138 =
  20. 20.836 + 135 =
  21. 21.787 + 180 =
  22. 22.330 − 105 =
  23. 23.231 + 166 =
  24. 24.133 + 289 =
  25. 25.A train has 288 people in the front coaches and 487 people in the back coaches. How many people are on the train?
  26. 26.167 + 585 =
  27. 27.772 − ? = 195
  28. 28.? + 710 = 996
  29. 29.869 − 608 =
  30. 30.475 − ? = 253
  31. 31.575 + 420 =
  32. 32.503 + ? = 892
  33. 33.392 − 278 =
  34. 34.A train has 216 people in the front coaches and 607 people in the back coaches. How many people are on the train?
  35. 35.143 + 370 =
  36. 36.354 − ? = 217
  37. 37.339 − ? = 137
  38. 38.532 + 272 =
  39. 39.728 + 124 =
  40. 40.A train has 587 people in the front coaches and 250 people in the back coaches. How many people are on the train?

Answer key

  1. 188
  2. 224
  3. 215
  4. 288
  5. 260
  6. 26
  7. 228
  8. 124
  9. 463
  10. 72
  11. 731
  12. 343
  13. 789
  14. 572
  15. 171
  16. 56
  17. 411
  18. 20
  19. 80
  20. 971
  21. 967
  22. 225
  23. 397
  24. 422
  25. 775
  26. 752
  27. 577
  28. 286
  29. 261
  30. 222
  31. 995
  32. 389
  33. 114
  34. 823
  35. 513
  36. 137
  37. 202
  38. 804
  39. 852
  40. 837

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