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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 963 · 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. 1.220 + 277 =
  2. 2.220 + 509 =
  3. 3.731 + 119 =
  4. 4.A train has 165 people in the front coaches and 725 people in the back coaches. How many people are on the train?
  5. 5.A school has 392 children. 387 of them are girls. How many boys are there?
  6. 6.760 − 609 =
  7. 7.499 − 194 =
  8. 8.A train has 381 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  9. 9.589 + ? = 747
  10. 10.? + 247 = 400
  11. 11.482 + 422 =
  12. 12.? + 857 = 966
  13. 13.A school has 834 children. 629 of them are girls. How many boys are there?
  14. 14.271 − ? = 106
  15. 15.A train has 275 people in the front coaches and 369 people in the back coaches. How many people are on the train?
  16. 16.? − 601 = 283
  17. 17.101 + 268 =
  18. 18.438 − 407 =
  19. 19.104 + 781 =
  20. 20.327 + 458 =
  21. 21.? + 458 = 949
  22. 22.683 − 356 =
  23. 23.A train has 487 people in the front coaches and 416 people in the back coaches. How many people are on the train?
  24. 24.431 − 330 =
  25. 25.723 + 151 =
  26. 26.120 + ? = 952
  27. 27.? + 385 = 830
  28. 28.865 + 106 =
  29. 29.A school has 503 children. 310 of them are girls. How many boys are there?
  30. 30.A train has 781 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  31. 31.208 − 123 =
  32. 32.A train has 178 people in the front coaches and 362 people in the back coaches. How many people are on the train?
  33. 33.A school has 954 children. 232 of them are girls. How many boys are there?
  34. 34.A train has 131 people in the front coaches and 289 people in the back coaches. How many people are on the train?
  35. 35.A train has 308 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  36. 36.? + 302 = 577
  37. 37.871 + ? = 978
  38. 38.234 − 194 =
  39. 39.967 − ? = 51
  40. 40.333 − ? = 97

Answer key

  1. 497
  2. 729
  3. 850
  4. 890
  5. 5
  6. 151
  7. 305
  8. 506
  9. 158
  10. 153
  11. 904
  12. 109
  13. 205
  14. 165
  15. 644
  16. 884
  17. 369
  18. 31
  19. 885
  20. 785
  21. 491
  22. 327
  23. 903
  24. 101
  25. 874
  26. 832
  27. 445
  28. 971
  29. 193
  30. 958
  31. 85
  32. 540
  33. 722
  34. 420
  35. 418
  36. 275
  37. 107
  38. 40
  39. 916
  40. 236

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