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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 747 · 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 623 children. 512 of them are girls. How many boys are there?
  2. 2.458 + 281 =
  3. 3.853 − ? = 689
  4. 4.743 + 100 =
  5. 5.706 + 200 =
  6. 6.244 − 132 =
  7. 7.A train has 640 people in the front coaches and 353 people in the back coaches. How many people are on the train?
  8. 8.281 − 207 =
  9. 9.936 − 625 =
  10. 10.A school has 260 children. 102 of them are girls. How many boys are there?
  11. 11.556 + 117 =
  12. 12.A school has 427 children. 190 of them are girls. How many boys are there?
  13. 13.735 + 226 =
  14. 14.? + 828 = 974
  15. 15.367 + 377 =
  16. 16.996 − 914 =
  17. 17.A school has 379 children. 248 of them are girls. How many boys are there?
  18. 18.756 + ? = 991
  19. 19.278 − ? = 95
  20. 20.905 − ? = 262
  21. 21.892 − 842 =
  22. 22.642 − ? = 299
  23. 23.A school has 452 children. 175 of them are girls. How many boys are there?
  24. 24.307 − 159 =
  25. 25.252 − 138 =
  26. 26.? + 430 = 560
  27. 27.A train has 603 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  28. 28.992 − ? = 67
  29. 29.686 + 313 =
  30. 30.752 − ? = 323
  31. 31.A school has 310 children. 150 of them are girls. How many boys are there?
  32. 32.658 − ? = 443
  33. 33.A school has 771 children. 531 of them are girls. How many boys are there?
  34. 34.A school has 712 children. 430 of them are girls. How many boys are there?
  35. 35.? − 164 = 55
  36. 36.193 + ? = 891
  37. 37.? + 220 = 668
  38. 38.A train has 764 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  39. 39.471 + 329 =
  40. 40.272 − ? = 73

Answer key

  1. 111
  2. 739
  3. 164
  4. 843
  5. 906
  6. 112
  7. 993
  8. 74
  9. 311
  10. 158
  11. 673
  12. 237
  13. 961
  14. 146
  15. 744
  16. 82
  17. 131
  18. 235
  19. 183
  20. 643
  21. 50
  22. 343
  23. 277
  24. 148
  25. 114
  26. 130
  27. 794
  28. 925
  29. 999
  30. 429
  31. 160
  32. 215
  33. 240
  34. 282
  35. 219
  36. 698
  37. 448
  38. 864
  39. 800
  40. 199

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