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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 186 · 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. 1.662 + ? = 804
  2. 2.222 − ? = 110
  3. 3.A school has 330 children. 164 of them are girls. How many boys are there?
  4. 4.A school has 909 children. 373 of them are girls. How many boys are there?
  5. 5.936 − ? = 788
  6. 6.221 − 119 =
  7. 7.? − 216 = 181
  8. 8.318 − 243 =
  9. 9.A school has 382 children. 369 of them are girls. How many boys are there?
  10. 10.464 − ? = 168
  11. 11.277 − ? = 176
  12. 12.A train has 641 people in the front coaches and 290 people in the back coaches. How many people are on the train?
  13. 13.? + 395 = 649
  14. 14.318 + 389 =
  15. 15.A school has 400 children. 209 of them are girls. How many boys are there?
  16. 16.747 + ? = 887
  17. 17.222 + 633 =
  18. 18.819 − 208 =
  19. 19.? − 466 = 495
  20. 20.882 + ? = 992
  21. 21.308 + 480 =
  22. 22.A train has 797 people in the front coaches and 178 people in the back coaches. How many people are on the train?
  23. 23.169 + 304 =
  24. 24.856 + ? = 965
  25. 25.252 − 107 =
  26. 26.A train has 566 people in the front coaches and 193 people in the back coaches. How many people are on the train?
  27. 27.438 + 478 =
  28. 28.? + 257 = 440
  29. 29.A train has 367 people in the front coaches and 253 people in the back coaches. How many people are on the train?
  30. 30.983 − ? = 557
  31. 31.A train has 514 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  32. 32.A train has 491 people in the front coaches and 397 people in the back coaches. How many people are on the train?
  33. 33.602 + 317 =
  34. 34.413 + 391 =
  35. 35.? + 603 = 919
  36. 36.A train has 792 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  37. 37.421 + 257 =
  38. 38.A school has 636 children. 544 of them are girls. How many boys are there?
  39. 39.507 + 128 =
  40. 40.455 + 452 =

Answer key

  1. 142
  2. 112
  3. 166
  4. 536
  5. 148
  6. 102
  7. 397
  8. 75
  9. 13
  10. 296
  11. 101
  12. 931
  13. 254
  14. 707
  15. 191
  16. 140
  17. 855
  18. 611
  19. 961
  20. 110
  21. 788
  22. 975
  23. 473
  24. 109
  25. 145
  26. 759
  27. 916
  28. 183
  29. 620
  30. 426
  31. 616
  32. 888
  33. 919
  34. 804
  35. 316
  36. 898
  37. 678
  38. 92
  39. 635
  40. 907

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