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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 3 · 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. 1.572 − ? = 177
  2. 2.226 − 175 =
  3. 3.777 + 134 =
  4. 4.? − 194 = 50
  5. 5.A train has 385 people in the front coaches and 393 people in the back coaches. How many people are on the train?
  6. 6.477 + 158 =
  7. 7.225 − ? = 22
  8. 8.978 − ? = 147
  9. 9.221 + 700 =
  10. 10.625 + 359 =
  11. 11.410 − ? = 245
  12. 12.426 + ? = 892
  13. 13.800 + 172 =
  14. 14.579 + ? = 895
  15. 15.A school has 462 children. 156 of them are girls. How many boys are there?
  16. 16.A train has 293 people in the front coaches and 157 people in the back coaches. How many people are on the train?
  17. 17.? − 356 = 490
  18. 18.589 + 274 =
  19. 19.A train has 807 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  20. 20.773 + 105 =
  21. 21.A school has 388 children. 106 of them are girls. How many boys are there?
  22. 22.? − 887 = 74
  23. 23.A train has 324 people in the front coaches and 610 people in the back coaches. How many people are on the train?
  24. 24.890 + 107 =
  25. 25.? − 293 = 367
  26. 26.788 − ? = 312
  27. 27.518 + 234 =
  28. 28.A train has 685 people in the front coaches and 172 people in the back coaches. How many people are on the train?
  29. 29.572 + ? = 679
  30. 30.? + 185 = 400
  31. 31.A train has 587 people in the front coaches and 348 people in the back coaches. How many people are on the train?
  32. 32.386 − 232 =
  33. 33.A train has 759 people in the front coaches and 230 people in the back coaches. How many people are on the train?
  34. 34.? − 151 = 723
  35. 35.453 + 149 =
  36. 36.A train has 258 people in the front coaches and 283 people in the back coaches. How many people are on the train?
  37. 37.A train has 861 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  38. 38.368 + ? = 719
  39. 39.? − 186 = 228
  40. 40.A school has 391 children. 122 of them are girls. How many boys are there?

Answer key

  1. 395
  2. 51
  3. 911
  4. 244
  5. 778
  6. 635
  7. 203
  8. 831
  9. 921
  10. 984
  11. 165
  12. 466
  13. 972
  14. 316
  15. 306
  16. 450
  17. 846
  18. 863
  19. 944
  20. 878
  21. 282
  22. 961
  23. 934
  24. 997
  25. 660
  26. 476
  27. 752
  28. 857
  29. 107
  30. 215
  31. 935
  32. 154
  33. 989
  34. 874
  35. 602
  36. 541
  37. 983
  38. 351
  39. 414
  40. 269

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