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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 89 · 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. 1.565 − 391 =
  2. 2.A school has 878 children. 644 of them are girls. How many boys are there?
  3. 3.380 + 332 =
  4. 4.385 − 221 =
  5. 5.? + 205 = 632
  6. 6.A train has 413 people in the front coaches and 397 people in the back coaches. How many people are on the train?
  7. 7.615 − 173 =
  8. 8.A school has 386 children. 238 of them are girls. How many boys are there?
  9. 9.241 − 218 =
  10. 10.607 + ? = 716
  11. 11.A school has 277 children. 178 of them are girls. How many boys are there?
  12. 12.? + 262 = 783
  13. 13.A school has 614 children. 523 of them are girls. How many boys are there?
  14. 14.777 + 168 =
  15. 15.? − 301 = 652
  16. 16.430 − 207 =
  17. 17.? − 359 = 499
  18. 18.644 + 271 =
  19. 19.A train has 151 people in the front coaches and 239 people in the back coaches. How many people are on the train?
  20. 20.? − 135 = 277
  21. 21.A school has 224 children. 112 of them are girls. How many boys are there?
  22. 22.? − 203 = 29
  23. 23.A school has 285 children. 147 of them are girls. How many boys are there?
  24. 24.723 + 218 =
  25. 25.? + 564 = 760
  26. 26.720 + 173 =
  27. 27.A train has 105 people in the front coaches and 880 people in the back coaches. How many people are on the train?
  28. 28.A train has 306 people in the front coaches and 366 people in the back coaches. How many people are on the train?
  29. 29.653 − ? = 221
  30. 30.A school has 949 children. 301 of them are girls. How many boys are there?
  31. 31.? + 606 = 746
  32. 32.A train has 682 people in the front coaches and 223 people in the back coaches. How many people are on the train?
  33. 33.? − 119 = 101
  34. 34.? + 122 = 820
  35. 35.? − 128 = 276
  36. 36.709 + 102 =
  37. 37.339 + 579 =
  38. 38.379 − 134 =
  39. 39.963 − ? = 227
  40. 40.446 − 201 =

Answer key

  1. 174
  2. 234
  3. 712
  4. 164
  5. 427
  6. 810
  7. 442
  8. 148
  9. 23
  10. 109
  11. 99
  12. 521
  13. 91
  14. 945
  15. 953
  16. 223
  17. 858
  18. 915
  19. 390
  20. 412
  21. 112
  22. 232
  23. 138
  24. 941
  25. 196
  26. 893
  27. 985
  28. 672
  29. 432
  30. 648
  31. 140
  32. 905
  33. 220
  34. 698
  35. 404
  36. 811
  37. 918
  38. 245
  39. 736
  40. 245

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