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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 913 · 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.A train has 217 people in the front coaches and 754 people in the back coaches. How many people are on the train?
  2. 2.268 + ? = 998
  3. 3.469 − 119 =
  4. 4.870 + 126 =
  5. 5.550 + 161 =
  6. 6.358 + ? = 458
  7. 7.245 + 206 =
  8. 8.A train has 520 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  9. 9.660 + 325 =
  10. 10.837 − 821 =
  11. 11.240 + 503 =
  12. 12.A school has 593 children. 288 of them are girls. How many boys are there?
  13. 13.747 + 162 =
  14. 14.A train has 861 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  15. 15.714 + 146 =
  16. 16.315 − 291 =
  17. 17.823 + 172 =
  18. 18.635 + ? = 824
  19. 19.878 − 258 =
  20. 20.A school has 629 children. 546 of them are girls. How many boys are there?
  21. 21.A train has 880 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  22. 22.A school has 884 children. 473 of them are girls. How many boys are there?
  23. 23.? − 512 = 28
  24. 24.? + 321 = 894
  25. 25.A school has 519 children. 445 of them are girls. How many boys are there?
  26. 26.? + 856 = 987
  27. 27.327 − 102 =
  28. 28.860 − 433 =
  29. 29.371 + ? = 667
  30. 30.? − 120 = 319
  31. 31.A train has 591 people in the front coaches and 373 people in the back coaches. How many people are on the train?
  32. 32.737 + ? = 898
  33. 33.739 − ? = 417
  34. 34.857 + 120 =
  35. 35.739 − 189 =
  36. 36.A school has 853 children. 398 of them are girls. How many boys are there?
  37. 37.691 − 184 =
  38. 38.A train has 850 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  39. 39.679 + 217 =
  40. 40.A school has 367 children. 165 of them are girls. How many boys are there?

Answer key

  1. 971
  2. 730
  3. 350
  4. 996
  5. 711
  6. 100
  7. 451
  8. 828
  9. 985
  10. 16
  11. 743
  12. 305
  13. 909
  14. 962
  15. 860
  16. 24
  17. 995
  18. 189
  19. 620
  20. 83
  21. 995
  22. 411
  23. 540
  24. 573
  25. 74
  26. 131
  27. 225
  28. 427
  29. 296
  30. 439
  31. 964
  32. 161
  33. 322
  34. 977
  35. 550
  36. 455
  37. 507
  38. 981
  39. 896
  40. 202

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