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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 722 · 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 school has 490 children. 236 of them are girls. How many boys are there?
  2. 2.A train has 492 people in the front coaches and 367 people in the back coaches. How many people are on the train?
  3. 3.A train has 111 people in the front coaches and 310 people in the back coaches. How many people are on the train?
  4. 4.666 − 216 =
  5. 5.424 + 237 =
  6. 6.A school has 933 children. 793 of them are girls. How many boys are there?
  7. 7.200 + ? = 746
  8. 8.A train has 754 people in the front coaches and 188 people in the back coaches. How many people are on the train?
  9. 9.283 + 274 =
  10. 10.996 − 921 =
  11. 11.A school has 520 children. 308 of them are girls. How many boys are there?
  12. 12.288 + 273 =
  13. 13.566 + ? = 780
  14. 14.870 + ? = 984
  15. 15.768 + 105 =
  16. 16.909 − 201 =
  17. 17.674 − ? = 421
  18. 18.984 − 827 =
  19. 19.752 + ? = 978
  20. 20.512 − 166 =
  21. 21.A train has 837 people in the front coaches and 119 people in the back coaches. How many people are on the train?
  22. 22.964 − 507 =
  23. 23.? + 216 = 500
  24. 24.? + 740 = 845
  25. 25.? + 595 = 765
  26. 26.548 + 236 =
  27. 27.328 − ? = 52
  28. 28.A train has 551 people in the front coaches and 282 people in the back coaches. How many people are on the train?
  29. 29.A school has 731 children. 170 of them are girls. How many boys are there?
  30. 30.A school has 330 children. 105 of them are girls. How many boys are there?
  31. 31.? + 302 = 433
  32. 32.A school has 430 children. 383 of them are girls. How many boys are there?
  33. 33.A school has 821 children. 678 of them are girls. How many boys are there?
  34. 34.? − 499 = 116
  35. 35.? + 415 = 575
  36. 36.803 − 717 =
  37. 37.A school has 226 children. 160 of them are girls. How many boys are there?
  38. 38.203 + 318 =
  39. 39.A school has 713 children. 473 of them are girls. How many boys are there?
  40. 40.A school has 348 children. 220 of them are girls. How many boys are there?

Answer key

  1. 254
  2. 859
  3. 421
  4. 450
  5. 661
  6. 140
  7. 546
  8. 942
  9. 557
  10. 75
  11. 212
  12. 561
  13. 214
  14. 114
  15. 873
  16. 708
  17. 253
  18. 157
  19. 226
  20. 346
  21. 956
  22. 457
  23. 284
  24. 105
  25. 170
  26. 784
  27. 276
  28. 833
  29. 561
  30. 225
  31. 131
  32. 47
  33. 143
  34. 615
  35. 160
  36. 86
  37. 66
  38. 521
  39. 240
  40. 128

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