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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 724 · 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. 1.797 + 190 =
  2. 2.A school has 625 children. 193 of them are girls. How many boys are there?
  3. 3.444 + ? = 890
  4. 4.A school has 892 children. 809 of them are girls. How many boys are there?
  5. 5.A train has 470 people in the front coaches and 302 people in the back coaches. How many people are on the train?
  6. 6.933 − 714 =
  7. 7.624 − ? = 245
  8. 8.A train has 753 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  9. 9.A train has 105 people in the front coaches and 890 people in the back coaches. How many people are on the train?
  10. 10.408 + 232 =
  11. 11.568 − 383 =
  12. 12.267 + 318 =
  13. 13.A train has 436 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  14. 14.179 + ? = 469
  15. 15.681 + 247 =
  16. 16.A school has 446 children. 166 of them are girls. How many boys are there?
  17. 17.A train has 852 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  18. 18.A train has 208 people in the front coaches and 710 people in the back coaches. How many people are on the train?
  19. 19.A train has 146 people in the front coaches and 802 people in the back coaches. How many people are on the train?
  20. 20.A train has 603 people in the front coaches and 351 people in the back coaches. How many people are on the train?
  21. 21.A train has 497 people in the front coaches and 411 people in the back coaches. How many people are on the train?
  22. 22.747 + 102 =
  23. 23.983 − 386 =
  24. 24.446 + 429 =
  25. 25.A train has 768 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  26. 26.507 − 376 =
  27. 27.324 + 355 =
  28. 28.270 + 412 =
  29. 29.A school has 581 children. 331 of them are girls. How many boys are there?
  30. 30.397 − ? = 274
  31. 31.321 − 203 =
  32. 32.? + 817 = 971
  33. 33.A train has 649 people in the front coaches and 138 people in the back coaches. How many people are on the train?
  34. 34.308 − 294 =
  35. 35.A train has 499 people in the front coaches and 238 people in the back coaches. How many people are on the train?
  36. 36.A train has 497 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  37. 37.457 − 152 =
  38. 38.A school has 294 children. 156 of them are girls. How many boys are there?
  39. 39.318 − 186 =
  40. 40.503 + ? = 688

Answer key

  1. 987
  2. 432
  3. 446
  4. 83
  5. 772
  6. 219
  7. 379
  8. 878
  9. 995
  10. 640
  11. 185
  12. 585
  13. 621
  14. 290
  15. 928
  16. 280
  17. 967
  18. 918
  19. 948
  20. 954
  21. 908
  22. 849
  23. 597
  24. 875
  25. 875
  26. 131
  27. 679
  28. 682
  29. 250
  30. 123
  31. 118
  32. 154
  33. 787
  34. 14
  35. 737
  36. 610
  37. 305
  38. 138
  39. 132
  40. 185

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