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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 124 · 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 train has 668 people in the front coaches and 327 people in the back coaches. How many people are on the train?
  2. 2.A train has 743 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  3. 3.337 + 206 =
  4. 4.A train has 516 people in the front coaches and 194 people in the back coaches. How many people are on the train?
  5. 5.999 − ? = 187
  6. 6.A train has 200 people in the front coaches and 409 people in the back coaches. How many people are on the train?
  7. 7.511 − 301 =
  8. 8.477 − 146 =
  9. 9.? − 378 = 345
  10. 10.864 + 106 =
  11. 11.? + 871 = 982
  12. 12.A train has 211 people in the front coaches and 155 people in the back coaches. How many people are on the train?
  13. 13.235 − 107 =
  14. 14.A train has 845 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  15. 15.373 − 155 =
  16. 16.917 − 695 =
  17. 17.537 − ? = 65
  18. 18.361 + 496 =
  19. 19.472 − ? = 56
  20. 20.790 − 323 =
  21. 21.235 − 140 =
  22. 22.A school has 596 children. 184 of them are girls. How many boys are there?
  23. 23.299 + 420 =
  24. 24.618 − 433 =
  25. 25.A school has 327 children. 111 of them are girls. How many boys are there?
  26. 26.686 + 116 =
  27. 27.762 − 314 =
  28. 28.737 − 114 =
  29. 29.A school has 838 children. 531 of them are girls. How many boys are there?
  30. 30.? + 891 = 993
  31. 31.484 − 276 =
  32. 32.750 + 149 =
  33. 33.A train has 282 people in the front coaches and 693 people in the back coaches. How many people are on the train?
  34. 34.A school has 498 children. 377 of them are girls. How many boys are there?
  35. 35.? + 413 = 797
  36. 36.826 + 129 =
  37. 37.A train has 740 people in the front coaches and 188 people in the back coaches. How many people are on the train?
  38. 38.447 + ? = 938
  39. 39.A school has 738 children. 444 of them are girls. How many boys are there?
  40. 40.874 − 437 =

Answer key

  1. 995
  2. 892
  3. 543
  4. 710
  5. 812
  6. 609
  7. 210
  8. 331
  9. 723
  10. 970
  11. 111
  12. 366
  13. 128
  14. 954
  15. 218
  16. 222
  17. 472
  18. 857
  19. 416
  20. 467
  21. 95
  22. 412
  23. 719
  24. 185
  25. 216
  26. 802
  27. 448
  28. 623
  29. 307
  30. 102
  31. 208
  32. 899
  33. 975
  34. 121
  35. 384
  36. 955
  37. 928
  38. 491
  39. 294
  40. 437

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