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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 840 · 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. 1.890 + 102 =
  2. 2.A train has 479 people in the front coaches and 377 people in the back coaches. How many people are on the train?
  3. 3.939 − 804 =
  4. 4.341 + ? = 762
  5. 5.A train has 593 people in the front coaches and 157 people in the back coaches. How many people are on the train?
  6. 6.696 + ? = 931
  7. 7.891 − 713 =
  8. 8.472 + 282 =
  9. 9.447 + ? = 591
  10. 10.224 − 178 =
  11. 11.563 − ? = 456
  12. 12.A school has 633 children. 364 of them are girls. How many boys are there?
  13. 13.315 + 444 =
  14. 14.A school has 285 children. 210 of them are girls. How many boys are there?
  15. 15.676 − ? = 485
  16. 16.141 + 314 =
  17. 17.? − 391 = 80
  18. 18.A train has 861 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  19. 19.344 − 135 =
  20. 20.880 + 111 =
  21. 21.? + 578 = 714
  22. 22.A school has 255 children. 126 of them are girls. How many boys are there?
  23. 23.761 − 506 =
  24. 24.864 + 124 =
  25. 25.A train has 413 people in the front coaches and 361 people in the back coaches. How many people are on the train?
  26. 26.294 + 457 =
  27. 27.A school has 757 children. 377 of them are girls. How many boys are there?
  28. 28.? + 147 = 975
  29. 29.A school has 741 children. 182 of them are girls. How many boys are there?
  30. 30.423 − ? = 165
  31. 31.238 − ? = 5
  32. 32.891 − 385 =
  33. 33.A train has 395 people in the front coaches and 570 people in the back coaches. How many people are on the train?
  34. 34.677 − ? = 330
  35. 35.693 − 324 =
  36. 36.807 − ? = 353
  37. 37.220 + 111 =
  38. 38.A school has 568 children. 415 of them are girls. How many boys are there?
  39. 39.323 − 295 =
  40. 40.A school has 945 children. 846 of them are girls. How many boys are there?

Answer key

  1. 992
  2. 856
  3. 135
  4. 421
  5. 750
  6. 235
  7. 178
  8. 754
  9. 144
  10. 46
  11. 107
  12. 269
  13. 759
  14. 75
  15. 191
  16. 455
  17. 471
  18. 998
  19. 209
  20. 991
  21. 136
  22. 129
  23. 255
  24. 988
  25. 774
  26. 751
  27. 380
  28. 828
  29. 559
  30. 258
  31. 233
  32. 506
  33. 965
  34. 347
  35. 369
  36. 454
  37. 331
  38. 153
  39. 28
  40. 99

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