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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 342 · 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. 1.356 − ? = 43
  2. 2.817 + 109 =
  3. 3.A train has 387 people in the front coaches and 275 people in the back coaches. How many people are on the train?
  4. 4.? + 305 = 706
  5. 5.A school has 646 children. 563 of them are girls. How many boys are there?
  6. 6.? − 664 = 316
  7. 7.618 − 535 =
  8. 8.A school has 696 children. 109 of them are girls. How many boys are there?
  9. 9.432 + ? = 714
  10. 10.176 + ? = 435
  11. 11.652 − ? = 432
  12. 12.? − 584 = 386
  13. 13.A school has 226 children. 124 of them are girls. How many boys are there?
  14. 14.851 + 127 =
  15. 15.A train has 639 people in the front coaches and 263 people in the back coaches. How many people are on the train?
  16. 16.677 + ? = 926
  17. 17.354 + 115 =
  18. 18.638 − ? = 425
  19. 19.359 + 582 =
  20. 20.383 + ? = 607
  21. 21.954 − 632 =
  22. 22.390 + 222 =
  23. 23.238 − 172 =
  24. 24.A school has 245 children. 127 of them are girls. How many boys are there?
  25. 25.432 + 526 =
  26. 26.A train has 304 people in the front coaches and 330 people in the back coaches. How many people are on the train?
  27. 27.? − 184 = 188
  28. 28.219 + 134 =
  29. 29.A train has 131 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  30. 30.836 − ? = 343
  31. 31.746 + ? = 956
  32. 32.A school has 316 children. 310 of them are girls. How many boys are there?
  33. 33.420 + 302 =
  34. 34.813 + 133 =
  35. 35.445 + 142 =
  36. 36.A school has 585 children. 519 of them are girls. How many boys are there?
  37. 37.A school has 989 children. 590 of them are girls. How many boys are there?
  38. 38.465 + 261 =
  39. 39.268 − 146 =
  40. 40.? − 192 = 72

Answer key

  1. 313
  2. 926
  3. 662
  4. 401
  5. 83
  6. 980
  7. 83
  8. 587
  9. 282
  10. 259
  11. 220
  12. 970
  13. 102
  14. 978
  15. 902
  16. 249
  17. 469
  18. 213
  19. 941
  20. 224
  21. 322
  22. 612
  23. 66
  24. 118
  25. 958
  26. 634
  27. 372
  28. 353
  29. 245
  30. 493
  31. 210
  32. 6
  33. 722
  34. 946
  35. 587
  36. 66
  37. 399
  38. 726
  39. 122
  40. 264

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