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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 599 · 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 127 people in the front coaches and 870 people in the back coaches. How many people are on the train?
  2. 2.505 − 435 =
  3. 3.885 + 102 =
  4. 4.A train has 416 people in the front coaches and 437 people in the back coaches. How many people are on the train?
  5. 5.A train has 739 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  6. 6.A train has 550 people in the front coaches and 273 people in the back coaches. How many people are on the train?
  7. 7.276 + ? = 415
  8. 8.A train has 480 people in the front coaches and 301 people in the back coaches. How many people are on the train?
  9. 9.898 + ? = 998
  10. 10.? + 246 = 736
  11. 11.? − 154 = 277
  12. 12.242 − 215 =
  13. 13.489 + 501 =
  14. 14.? − 124 = 792
  15. 15.313 − ? = 10
  16. 16.A train has 625 people in the front coaches and 345 people in the back coaches. How many people are on the train?
  17. 17.A train has 687 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  18. 18.949 − 818 =
  19. 19.A school has 324 children. 152 of them are girls. How many boys are there?
  20. 20.600 + 170 =
  21. 21.775 − 562 =
  22. 22.A school has 249 children. 241 of them are girls. How many boys are there?
  23. 23.606 − 104 =
  24. 24.961 − ? = 177
  25. 25.? − 278 = 367
  26. 26.687 − 437 =
  27. 27.A train has 482 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  28. 28.A train has 303 people in the front coaches and 294 people in the back coaches. How many people are on the train?
  29. 29.426 − 260 =
  30. 30.464 + 361 =
  31. 31.A train has 127 people in the front coaches and 318 people in the back coaches. How many people are on the train?
  32. 32.124 + 810 =
  33. 33.A school has 557 children. 478 of them are girls. How many boys are there?
  34. 34.A train has 516 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  35. 35.? + 211 = 620
  36. 36.487 + ? = 665
  37. 37.858 − 269 =
  38. 38.466 + 121 =
  39. 39.A school has 771 children. 753 of them are girls. How many boys are there?
  40. 40.433 − 102 =

Answer key

  1. 997
  2. 70
  3. 987
  4. 853
  5. 854
  6. 823
  7. 139
  8. 781
  9. 100
  10. 490
  11. 431
  12. 27
  13. 990
  14. 916
  15. 303
  16. 970
  17. 836
  18. 131
  19. 172
  20. 770
  21. 213
  22. 8
  23. 502
  24. 784
  25. 645
  26. 250
  27. 758
  28. 597
  29. 166
  30. 825
  31. 445
  32. 934
  33. 79
  34. 660
  35. 409
  36. 178
  37. 589
  38. 587
  39. 18
  40. 331

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