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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 945 · 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. 1.211 − 190 =
  2. 2.611 + ? = 754
  3. 3.? + 102 = 552
  4. 4.392 + 307 =
  5. 5.404 + 247 =
  6. 6.A train has 168 people in the front coaches and 810 people in the back coaches. How many people are on the train?
  7. 7.A train has 187 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  8. 8.A train has 202 people in the front coaches and 491 people in the back coaches. How many people are on the train?
  9. 9.? + 889 = 992
  10. 10.257 + 421 =
  11. 11.740 + ? = 923
  12. 12.557 − 415 =
  13. 13.835 + ? = 956
  14. 14.? − 375 = 580
  15. 15.A school has 399 children. 144 of them are girls. How many boys are there?
  16. 16.A train has 368 people in the front coaches and 483 people in the back coaches. How many people are on the train?
  17. 17.A school has 918 children. 186 of them are girls. How many boys are there?
  18. 18.A school has 472 children. 202 of them are girls. How many boys are there?
  19. 19.? − 162 = 317
  20. 20.A school has 868 children. 846 of them are girls. How many boys are there?
  21. 21.625 − 105 =
  22. 22.207 + 192 =
  23. 23.685 − 286 =
  24. 24.A school has 596 children. 517 of them are girls. How many boys are there?
  25. 25.767 − 404 =
  26. 26.? − 299 = 628
  27. 27.A school has 439 children. 190 of them are girls. How many boys are there?
  28. 28.523 − ? = 377
  29. 29.? + 265 = 977
  30. 30.A school has 260 children. 101 of them are girls. How many boys are there?
  31. 31.437 − ? = 298
  32. 32.291 + 633 =
  33. 33.344 − 223 =
  34. 34.793 − 470 =
  35. 35.807 − ? = 525
  36. 36.A school has 816 children. 545 of them are girls. How many boys are there?
  37. 37.529 + ? = 719
  38. 38.A train has 119 people in the front coaches and 705 people in the back coaches. How many people are on the train?
  39. 39.100 + ? = 871
  40. 40.498 + ? = 638

Answer key

  1. 21
  2. 143
  3. 450
  4. 699
  5. 651
  6. 978
  7. 367
  8. 693
  9. 103
  10. 678
  11. 183
  12. 142
  13. 121
  14. 955
  15. 255
  16. 851
  17. 732
  18. 270
  19. 479
  20. 22
  21. 520
  22. 399
  23. 399
  24. 79
  25. 363
  26. 927
  27. 249
  28. 146
  29. 712
  30. 159
  31. 139
  32. 924
  33. 121
  34. 323
  35. 282
  36. 271
  37. 190
  38. 824
  39. 771
  40. 140

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