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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 899 · 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. 1.776 + 130 =
  2. 2.370 + ? = 867
  3. 3.206 + 346 =
  4. 4.A train has 174 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  5. 5.A school has 213 children. 168 of them are girls. How many boys are there?
  6. 6.? − 140 = 424
  7. 7.? + 688 = 869
  8. 8.217 + ? = 629
  9. 9.273 − ? = 166
  10. 10.853 + 112 =
  11. 11.A school has 414 children. 188 of them are girls. How many boys are there?
  12. 12.232 − 122 =
  13. 13.566 + 161 =
  14. 14.567 − ? = 431
  15. 15.A train has 360 people in the front coaches and 250 people in the back coaches. How many people are on the train?
  16. 16.A train has 400 people in the front coaches and 419 people in the back coaches. How many people are on the train?
  17. 17.? − 490 = 5
  18. 18.A school has 505 children. 292 of them are girls. How many boys are there?
  19. 19.830 − ? = 621
  20. 20.383 + ? = 562
  21. 21.? − 191 = 18
  22. 22.A train has 513 people in the front coaches and 301 people in the back coaches. How many people are on the train?
  23. 23.? + 818 = 991
  24. 24.A school has 518 children. 477 of them are girls. How many boys are there?
  25. 25.A train has 692 people in the front coaches and 173 people in the back coaches. How many people are on the train?
  26. 26.A school has 832 children. 234 of them are girls. How many boys are there?
  27. 27.A school has 325 children. 313 of them are girls. How many boys are there?
  28. 28.798 − 245 =
  29. 29.224 − ? = 121
  30. 30.A train has 482 people in the front coaches and 343 people in the back coaches. How many people are on the train?
  31. 31.? − 526 = 337
  32. 32.499 − 277 =
  33. 33.A train has 182 people in the front coaches and 514 people in the back coaches. How many people are on the train?
  34. 34.532 + 157 =
  35. 35.A train has 566 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  36. 36.592 − 537 =
  37. 37.? − 418 = 185
  38. 38.A school has 651 children. 221 of them are girls. How many boys are there?
  39. 39.524 − ? = 92
  40. 40.879 − 160 =

Answer key

  1. 906
  2. 497
  3. 552
  4. 321
  5. 45
  6. 564
  7. 181
  8. 412
  9. 107
  10. 965
  11. 226
  12. 110
  13. 727
  14. 136
  15. 610
  16. 819
  17. 495
  18. 213
  19. 209
  20. 179
  21. 209
  22. 814
  23. 173
  24. 41
  25. 865
  26. 598
  27. 12
  28. 553
  29. 103
  30. 825
  31. 863
  32. 222
  33. 696
  34. 689
  35. 707
  36. 55
  37. 603
  38. 430
  39. 432
  40. 719

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