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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 15 · 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.? + 494 = 693
  2. 2.413 + 318 =
  3. 3.? − 240 = 395
  4. 4.? − 134 = 719
  5. 5.A school has 669 children. 329 of them are girls. How many boys are there?
  6. 6.? − 183 = 532
  7. 7.A train has 727 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  8. 8.687 + 184 =
  9. 9.446 + 145 =
  10. 10.? − 182 = 673
  11. 11.357 + ? = 497
  12. 12.274 + 488 =
  13. 13.740 − ? = 116
  14. 14.A school has 636 children. 526 of them are girls. How many boys are there?
  15. 15.909 − ? = 732
  16. 16.284 − 251 =
  17. 17.703 + 132 =
  18. 18.A school has 967 children. 149 of them are girls. How many boys are there?
  19. 19.A train has 854 people in the front coaches and 138 people in the back coaches. How many people are on the train?
  20. 20.A train has 153 people in the front coaches and 749 people in the back coaches. How many people are on the train?
  21. 21.920 − 637 =
  22. 22.708 + ? = 947
  23. 23.? + 799 = 933
  24. 24.A train has 478 people in the front coaches and 316 people in the back coaches. How many people are on the train?
  25. 25.459 − ? = 106
  26. 26.? − 108 = 118
  27. 27.A train has 195 people in the front coaches and 720 people in the back coaches. How many people are on the train?
  28. 28.947 − 335 =
  29. 29.286 + ? = 937
  30. 30.288 − 244 =
  31. 31.517 + 458 =
  32. 32.A school has 766 children. 187 of them are girls. How many boys are there?
  33. 33.488 + 400 =
  34. 34.467 + ? = 695
  35. 35.? + 556 = 872
  36. 36.254 + ? = 732
  37. 37.A school has 679 children. 245 of them are girls. How many boys are there?
  38. 38.A train has 467 people in the front coaches and 132 people in the back coaches. How many people are on the train?
  39. 39.A train has 353 people in the front coaches and 385 people in the back coaches. How many people are on the train?
  40. 40.277 − 242 =

Answer key

  1. 199
  2. 731
  3. 635
  4. 853
  5. 340
  6. 715
  7. 888
  8. 871
  9. 591
  10. 855
  11. 140
  12. 762
  13. 624
  14. 110
  15. 177
  16. 33
  17. 835
  18. 818
  19. 992
  20. 902
  21. 283
  22. 239
  23. 134
  24. 794
  25. 353
  26. 226
  27. 915
  28. 612
  29. 651
  30. 44
  31. 975
  32. 579
  33. 888
  34. 228
  35. 316
  36. 478
  37. 434
  38. 599
  39. 738
  40. 35

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