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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 428 · 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 525 people in the front coaches and 324 people in the back coaches. How many people are on the train?
  2. 2.A school has 385 children. 219 of them are girls. How many boys are there?
  3. 3.? − 206 = 239
  4. 4.? − 113 = 215
  5. 5.835 + 155 =
  6. 6.433 + 384 =
  7. 7.148 + ? = 482
  8. 8.A school has 684 children. 179 of them are girls. How many boys are there?
  9. 9.295 − 210 =
  10. 10.114 + 486 =
  11. 11.813 + 123 =
  12. 12.105 + 261 =
  13. 13.944 − 768 =
  14. 14.A school has 283 children. 127 of them are girls. How many boys are there?
  15. 15.A school has 591 children. 423 of them are girls. How many boys are there?
  16. 16.610 − ? = 478
  17. 17.212 + 227 =
  18. 18.164 + 234 =
  19. 19.A school has 616 children. 612 of them are girls. How many boys are there?
  20. 20.700 − 219 =
  21. 21.672 − 237 =
  22. 22.129 + ? = 837
  23. 23.558 − ? = 408
  24. 24.A train has 200 people in the front coaches and 649 people in the back coaches. How many people are on the train?
  25. 25.A school has 928 children. 927 of them are girls. How many boys are there?
  26. 26.390 − 379 =
  27. 27.? − 246 = 752
  28. 28.334 + 365 =
  29. 29.529 − 216 =
  30. 30.881 − 845 =
  31. 31.A train has 347 people in the front coaches and 622 people in the back coaches. How many people are on the train?
  32. 32.718 − 216 =
  33. 33.824 + 126 =
  34. 34.A school has 732 children. 714 of them are girls. How many boys are there?
  35. 35.A train has 638 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  36. 36.? − 126 = 830
  37. 37.224 − 192 =
  38. 38.360 + ? = 513
  39. 39.703 + 163 =
  40. 40.A school has 815 children. 632 of them are girls. How many boys are there?

Answer key

  1. 849
  2. 166
  3. 445
  4. 328
  5. 990
  6. 817
  7. 334
  8. 505
  9. 85
  10. 600
  11. 936
  12. 366
  13. 176
  14. 156
  15. 168
  16. 132
  17. 439
  18. 398
  19. 4
  20. 481
  21. 435
  22. 708
  23. 150
  24. 849
  25. 1
  26. 11
  27. 998
  28. 699
  29. 313
  30. 36
  31. 969
  32. 502
  33. 950
  34. 18
  35. 818
  36. 956
  37. 32
  38. 153
  39. 866
  40. 183

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