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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 901 · 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 578 people in the front coaches and 369 people in the back coaches. How many people are on the train?
  2. 2.512 + ? = 698
  3. 3.435 + 129 =
  4. 4.A train has 275 people in the front coaches and 595 people in the back coaches. How many people are on the train?
  5. 5.? − 191 = 260
  6. 6.566 + ? = 966
  7. 7.914 − ? = 293
  8. 8.A school has 407 children. 173 of them are girls. How many boys are there?
  9. 9.645 + 265 =
  10. 10.A train has 626 people in the front coaches and 329 people in the back coaches. How many people are on the train?
  11. 11.A school has 888 children. 781 of them are girls. How many boys are there?
  12. 12.? − 473 = 448
  13. 13.250 + 495 =
  14. 14.276 + ? = 961
  15. 15.101 + 193 =
  16. 16.715 − 214 =
  17. 17.? + 103 = 604
  18. 18.? − 238 = 116
  19. 19.811 − ? = 171
  20. 20.729 + ? = 906
  21. 21.335 + 247 =
  22. 22.590 + ? = 909
  23. 23.? + 265 = 709
  24. 24.269 + 118 =
  25. 25.308 + 589 =
  26. 26.354 + ? = 931
  27. 27.A school has 439 children. 387 of them are girls. How many boys are there?
  28. 28.? − 515 = 185
  29. 29.A school has 465 children. 306 of them are girls. How many boys are there?
  30. 30.332 + 535 =
  31. 31.835 + 132 =
  32. 32.A train has 724 people in the front coaches and 151 people in the back coaches. How many people are on the train?
  33. 33.206 + ? = 969
  34. 34.A school has 240 children. 234 of them are girls. How many boys are there?
  35. 35.232 − 206 =
  36. 36.? − 440 = 250
  37. 37.444 − ? = 200
  38. 38.? + 370 = 851
  39. 39.? + 484 = 711
  40. 40.397 + 194 =

Answer key

  1. 947
  2. 186
  3. 564
  4. 870
  5. 451
  6. 400
  7. 621
  8. 234
  9. 910
  10. 955
  11. 107
  12. 921
  13. 745
  14. 685
  15. 294
  16. 501
  17. 501
  18. 354
  19. 640
  20. 177
  21. 582
  22. 319
  23. 444
  24. 387
  25. 897
  26. 577
  27. 52
  28. 700
  29. 159
  30. 867
  31. 967
  32. 875
  33. 763
  34. 6
  35. 26
  36. 690
  37. 244
  38. 481
  39. 227
  40. 591

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