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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 239 · 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. 1.668 − 336 =
  2. 2.387 − ? = 192
  3. 3.332 − 215 =
  4. 4.A school has 609 children. 434 of them are girls. How many boys are there?
  5. 5.A school has 305 children. 170 of them are girls. How many boys are there?
  6. 6.? − 194 = 416
  7. 7.761 − 675 =
  8. 8.A train has 269 people in the front coaches and 126 people in the back coaches. How many people are on the train?
  9. 9.247 − ? = 125
  10. 10.A train has 634 people in the front coaches and 253 people in the back coaches. How many people are on the train?
  11. 11.A school has 919 children. 860 of them are girls. How many boys are there?
  12. 12.A school has 254 children. 142 of them are girls. How many boys are there?
  13. 13.A school has 354 children. 155 of them are girls. How many boys are there?
  14. 14.A train has 271 people in the front coaches and 398 people in the back coaches. How many people are on the train?
  15. 15.A school has 477 children. 348 of them are girls. How many boys are there?
  16. 16.212 − 164 =
  17. 17.318 − 256 =
  18. 18.653 + 206 =
  19. 19.? − 216 = 66
  20. 20.A train has 721 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  21. 21.725 + 198 =
  22. 22.A train has 547 people in the front coaches and 384 people in the back coaches. How many people are on the train?
  23. 23.499 − ? = 365
  24. 24.A train has 188 people in the front coaches and 543 people in the back coaches. How many people are on the train?
  25. 25.A school has 850 children. 595 of them are girls. How many boys are there?
  26. 26.A school has 234 children. 107 of them are girls. How many boys are there?
  27. 27.A train has 393 people in the front coaches and 478 people in the back coaches. How many people are on the train?
  28. 28.545 + 453 =
  29. 29.? + 849 = 979
  30. 30.655 + ? = 785
  31. 31.715 + 265 =
  32. 32.A train has 181 people in the front coaches and 612 people in the back coaches. How many people are on the train?
  33. 33.565 − 528 =
  34. 34.415 − 211 =
  35. 35.A school has 801 children. 473 of them are girls. How many boys are there?
  36. 36.292 + 121 =
  37. 37.114 + 742 =
  38. 38.A school has 373 children. 217 of them are girls. How many boys are there?
  39. 39.? − 264 = 104
  40. 40.? − 105 = 151

Answer key

  1. 332
  2. 195
  3. 117
  4. 175
  5. 135
  6. 610
  7. 86
  8. 395
  9. 122
  10. 887
  11. 59
  12. 112
  13. 199
  14. 669
  15. 129
  16. 48
  17. 62
  18. 859
  19. 282
  20. 935
  21. 923
  22. 931
  23. 134
  24. 731
  25. 255
  26. 127
  27. 871
  28. 998
  29. 130
  30. 130
  31. 980
  32. 793
  33. 37
  34. 204
  35. 328
  36. 413
  37. 856
  38. 156
  39. 368
  40. 256

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