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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 333 · 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. 1.798 − ? = 435
  2. 2.A school has 654 children. 323 of them are girls. How many boys are there?
  3. 3.A train has 564 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  4. 4.A school has 271 children. 110 of them are girls. How many boys are there?
  5. 5.625 + 104 =
  6. 6.? − 117 = 244
  7. 7.A school has 788 children. 388 of them are girls. How many boys are there?
  8. 8.A train has 754 people in the front coaches and 160 people in the back coaches. How many people are on the train?
  9. 9.466 − 126 =
  10. 10.503 − 450 =
  11. 11.566 − 367 =
  12. 12.786 − 315 =
  13. 13.241 + 430 =
  14. 14.391 − 305 =
  15. 15.A train has 277 people in the front coaches and 557 people in the back coaches. How many people are on the train?
  16. 16.828 + 111 =
  17. 17.A school has 377 children. 113 of them are girls. How many boys are there?
  18. 18.? − 226 = 10
  19. 19.A school has 539 children. 155 of them are girls. How many boys are there?
  20. 20.272 − 114 =
  21. 21.254 + 486 =
  22. 22.A train has 580 people in the front coaches and 373 people in the back coaches. How many people are on the train?
  23. 23.A train has 876 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  24. 24.637 + 134 =
  25. 25.641 + 279 =
  26. 26.538 − 350 =
  27. 27.817 + 138 =
  28. 28.249 − 187 =
  29. 29.387 − 367 =
  30. 30.? − 881 = 16
  31. 31.? − 198 = 616
  32. 32.711 − 222 =
  33. 33.878 + 109 =
  34. 34.670 + 297 =
  35. 35.223 + ? = 551
  36. 36.217 − 116 =
  37. 37.681 + 254 =
  38. 38.? − 228 = 127
  39. 39.A school has 578 children. 385 of them are girls. How many boys are there?
  40. 40.A train has 649 people in the front coaches and 260 people in the back coaches. How many people are on the train?

Answer key

  1. 363
  2. 331
  3. 766
  4. 161
  5. 729
  6. 361
  7. 400
  8. 914
  9. 340
  10. 53
  11. 199
  12. 471
  13. 671
  14. 86
  15. 834
  16. 939
  17. 264
  18. 236
  19. 384
  20. 158
  21. 740
  22. 953
  23. 988
  24. 771
  25. 920
  26. 188
  27. 955
  28. 62
  29. 20
  30. 897
  31. 814
  32. 489
  33. 987
  34. 967
  35. 328
  36. 101
  37. 935
  38. 355
  39. 193
  40. 909

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