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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 272 · 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 408 children. 168 of them are girls. How many boys are there?
  2. 2.A school has 652 children. 236 of them are girls. How many boys are there?
  3. 3.? + 351 = 716
  4. 4.A school has 765 children. 102 of them are girls. How many boys are there?
  5. 5.? + 431 = 936
  6. 6.871 − ? = 341
  7. 7.723 − ? = 14
  8. 8.A school has 578 children. 241 of them are girls. How many boys are there?
  9. 9.906 − 464 =
  10. 10.700 + 199 =
  11. 11.681 − 659 =
  12. 12.530 − 255 =
  13. 13.666 − ? = 7
  14. 14.771 + 164 =
  15. 15.A school has 585 children. 377 of them are girls. How many boys are there?
  16. 16.? + 625 = 908
  17. 17.748 + ? = 912
  18. 18.857 + 107 =
  19. 19.A train has 511 people in the front coaches and 328 people in the back coaches. How many people are on the train?
  20. 20.394 − 265 =
  21. 21.682 − ? = 424
  22. 22.469 + 495 =
  23. 23.223 + 598 =
  24. 24.A school has 224 children. 126 of them are girls. How many boys are there?
  25. 25.458 − ? = 324
  26. 26.A school has 759 children. 124 of them are girls. How many boys are there?
  27. 27.? − 327 = 24
  28. 28.? − 275 = 130
  29. 29.261 + 180 =
  30. 30.A train has 505 people in the front coaches and 196 people in the back coaches. How many people are on the train?
  31. 31.458 + ? = 559
  32. 32.916 − 264 =
  33. 33.833 + 158 =
  34. 34.A train has 803 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  35. 35.A school has 890 children. 211 of them are girls. How many boys are there?
  36. 36.? − 693 = 141
  37. 37.? + 379 = 605
  38. 38.988 − ? = 769
  39. 39.536 − 377 =
  40. 40.A train has 520 people in the front coaches and 108 people in the back coaches. How many people are on the train?

Answer key

  1. 240
  2. 416
  3. 365
  4. 663
  5. 505
  6. 530
  7. 709
  8. 337
  9. 442
  10. 899
  11. 22
  12. 275
  13. 659
  14. 935
  15. 208
  16. 283
  17. 164
  18. 964
  19. 839
  20. 129
  21. 258
  22. 964
  23. 821
  24. 98
  25. 134
  26. 635
  27. 351
  28. 405
  29. 441
  30. 701
  31. 101
  32. 652
  33. 991
  34. 918
  35. 679
  36. 834
  37. 226
  38. 219
  39. 159
  40. 628

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