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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 256 · 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 136 people in the front coaches and 290 people in the back coaches. How many people are on the train?
  2. 2.512 + 419 =
  3. 3.559 + ? = 991
  4. 4.902 − 455 =
  5. 5.967 − ? = 290
  6. 6.248 − 132 =
  7. 7.792 + 135 =
  8. 8.632 − ? = 237
  9. 9.? + 420 = 751
  10. 10.386 − 168 =
  11. 11.413 − ? = 301
  12. 12.234 + 425 =
  13. 13.383 − ? = 130
  14. 14.A school has 662 children. 100 of them are girls. How many boys are there?
  15. 15.A train has 643 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  16. 16.A train has 582 people in the front coaches and 219 people in the back coaches. How many people are on the train?
  17. 17.A school has 925 children. 449 of them are girls. How many boys are there?
  18. 18.156 + ? = 409
  19. 19.492 − 476 =
  20. 20.479 + 201 =
  21. 21.? − 192 = 329
  22. 22.A school has 846 children. 795 of them are girls. How many boys are there?
  23. 23.230 − 217 =
  24. 24.? − 124 = 298
  25. 25.? − 771 = 189
  26. 26.? − 263 = 95
  27. 27.336 − ? = 88
  28. 28.859 − ? = 187
  29. 29.A train has 815 people in the front coaches and 184 people in the back coaches. How many people are on the train?
  30. 30.258 + ? = 971
  31. 31.? + 668 = 859
  32. 32.225 − 160 =
  33. 33.419 + ? = 893
  34. 34.735 − 123 =
  35. 35.A school has 328 children. 145 of them are girls. How many boys are there?
  36. 36.272 + 183 =
  37. 37.A school has 413 children. 349 of them are girls. How many boys are there?
  38. 38.? − 293 = 93
  39. 39.242 + 167 =
  40. 40.A train has 781 people in the front coaches and 168 people in the back coaches. How many people are on the train?

Answer key

  1. 426
  2. 931
  3. 432
  4. 447
  5. 677
  6. 116
  7. 927
  8. 395
  9. 331
  10. 218
  11. 112
  12. 659
  13. 253
  14. 562
  15. 760
  16. 801
  17. 476
  18. 253
  19. 16
  20. 680
  21. 521
  22. 51
  23. 13
  24. 422
  25. 960
  26. 358
  27. 248
  28. 672
  29. 999
  30. 713
  31. 191
  32. 65
  33. 474
  34. 612
  35. 183
  36. 455
  37. 64
  38. 386
  39. 409
  40. 949

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