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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 878 · 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.? + 716 = 851
  2. 2.407 + 271 =
  3. 3.392 + 158 =
  4. 4.A train has 344 people in the front coaches and 631 people in the back coaches. How many people are on the train?
  5. 5.623 − 606 =
  6. 6.A train has 500 people in the front coaches and 179 people in the back coaches. How many people are on the train?
  7. 7.108 + ? = 922
  8. 8.440 + 245 =
  9. 9.254 + 519 =
  10. 10.A school has 665 children. 497 of them are girls. How many boys are there?
  11. 11.156 + ? = 323
  12. 12.A school has 239 children. 161 of them are girls. How many boys are there?
  13. 13.A train has 817 people in the front coaches and 163 people in the back coaches. How many people are on the train?
  14. 14.293 − ? = 185
  15. 15.A train has 304 people in the front coaches and 520 people in the back coaches. How many people are on the train?
  16. 16.272 + ? = 378
  17. 17.331 − 191 =
  18. 18.444 + 553 =
  19. 19.560 − 280 =
  20. 20.130 + ? = 943
  21. 21.435 − 156 =
  22. 22.894 − 161 =
  23. 23.808 + ? = 923
  24. 24.? − 194 = 700
  25. 25.574 − ? = 474
  26. 26.A train has 745 people in the front coaches and 237 people in the back coaches. How many people are on the train?
  27. 27.A train has 536 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  28. 28.343 + 220 =
  29. 29.526 − ? = 325
  30. 30.417 − 325 =
  31. 31.663 − 254 =
  32. 32.742 + 144 =
  33. 33.? + 186 = 619
  34. 34.A school has 894 children. 641 of them are girls. How many boys are there?
  35. 35.623 + 304 =
  36. 36.A train has 385 people in the front coaches and 397 people in the back coaches. How many people are on the train?
  37. 37.383 − 129 =
  38. 38.979 − 631 =
  39. 39.? − 308 = 76
  40. 40.A train has 822 people in the front coaches and 151 people in the back coaches. How many people are on the train?

Answer key

  1. 135
  2. 678
  3. 550
  4. 975
  5. 17
  6. 679
  7. 814
  8. 685
  9. 773
  10. 168
  11. 167
  12. 78
  13. 980
  14. 108
  15. 824
  16. 106
  17. 140
  18. 997
  19. 280
  20. 813
  21. 279
  22. 733
  23. 115
  24. 894
  25. 100
  26. 982
  27. 764
  28. 563
  29. 201
  30. 92
  31. 409
  32. 886
  33. 433
  34. 253
  35. 927
  36. 782
  37. 254
  38. 348
  39. 384
  40. 973

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