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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 611 · 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. 1.892 + ? = 993
  2. 2.854 + ? = 994
  3. 3.565 − 160 =
  4. 4.195 + 197 =
  5. 5.713 + ? = 878
  6. 6.431 − 423 =
  7. 7.A train has 671 people in the front coaches and 220 people in the back coaches. How many people are on the train?
  8. 8.293 + 698 =
  9. 9.A school has 790 children. 203 of them are girls. How many boys are there?
  10. 10.? + 139 = 279
  11. 11.121 + 118 =
  12. 12.459 − ? = 70
  13. 13.? + 791 = 911
  14. 14.717 + 167 =
  15. 15.A school has 229 children. 173 of them are girls. How many boys are there?
  16. 16.696 − 331 =
  17. 17.899 + 100 =
  18. 18.519 − 323 =
  19. 19.A train has 392 people in the front coaches and 446 people in the back coaches. How many people are on the train?
  20. 20.886 + 113 =
  21. 21.A school has 519 children. 251 of them are girls. How many boys are there?
  22. 22.? + 888 = 999
  23. 23.189 + ? = 399
  24. 24.230 − 128 =
  25. 25.526 + 446 =
  26. 26.354 − 289 =
  27. 27.A train has 842 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  28. 28.A school has 485 children. 350 of them are girls. How many boys are there?
  29. 29.? + 683 = 991
  30. 30.A school has 559 children. 267 of them are girls. How many boys are there?
  31. 31.906 − ? = 684
  32. 32.A train has 722 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  33. 33.A train has 657 people in the front coaches and 309 people in the back coaches. How many people are on the train?
  34. 34.A train has 335 people in the front coaches and 637 people in the back coaches. How many people are on the train?
  35. 35.A school has 939 children. 891 of them are girls. How many boys are there?
  36. 36.119 + 478 =
  37. 37.554 + ? = 688
  38. 38.246 − ? = 98
  39. 39.669 + 113 =
  40. 40.A train has 712 people in the front coaches and 177 people in the back coaches. How many people are on the train?

Answer key

  1. 101
  2. 140
  3. 405
  4. 392
  5. 165
  6. 8
  7. 891
  8. 991
  9. 587
  10. 140
  11. 239
  12. 389
  13. 120
  14. 884
  15. 56
  16. 365
  17. 999
  18. 196
  19. 838
  20. 999
  21. 268
  22. 111
  23. 210
  24. 102
  25. 972
  26. 65
  27. 975
  28. 135
  29. 308
  30. 292
  31. 222
  32. 913
  33. 966
  34. 972
  35. 48
  36. 597
  37. 134
  38. 148
  39. 782
  40. 889

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