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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 514 · 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. 1.157 + 361 =
  2. 2.437 − 328 =
  3. 3.? − 131 = 238
  4. 4.A school has 671 children. 115 of them are girls. How many boys are there?
  5. 5.A school has 852 children. 322 of them are girls. How many boys are there?
  6. 6.399 − 271 =
  7. 7.921 − 513 =
  8. 8.A train has 811 people in the front coaches and 164 people in the back coaches. How many people are on the train?
  9. 9.A train has 106 people in the front coaches and 251 people in the back coaches. How many people are on the train?
  10. 10.? + 167 = 944
  11. 11.760 + 197 =
  12. 12.A school has 287 children. 109 of them are girls. How many boys are there?
  13. 13.A school has 793 children. 699 of them are girls. How many boys are there?
  14. 14.A school has 281 children. 137 of them are girls. How many boys are there?
  15. 15.699 − 269 =
  16. 16.? − 260 = 358
  17. 17.629 + 193 =
  18. 18.A school has 602 children. 321 of them are girls. How many boys are there?
  19. 19.689 − 263 =
  20. 20.A school has 664 children. 307 of them are girls. How many boys are there?
  21. 21.208 − 141 =
  22. 22.691 + ? = 943
  23. 23.783 + 100 =
  24. 24.A school has 565 children. 110 of them are girls. How many boys are there?
  25. 25.? + 653 = 917
  26. 26.959 − 643 =
  27. 27.? − 446 = 4
  28. 28.A school has 447 children. 161 of them are girls. How many boys are there?
  29. 29.A school has 947 children. 444 of them are girls. How many boys are there?
  30. 30.? − 361 = 634
  31. 31.A school has 650 children. 376 of them are girls. How many boys are there?
  32. 32.800 − ? = 398
  33. 33.A train has 604 people in the front coaches and 373 people in the back coaches. How many people are on the train?
  34. 34.? − 437 = 8
  35. 35.456 − ? = 1
  36. 36.341 − 250 =
  37. 37.A train has 243 people in the front coaches and 382 people in the back coaches. How many people are on the train?
  38. 38.A train has 499 people in the front coaches and 354 people in the back coaches. How many people are on the train?
  39. 39.230 − ? = 114
  40. 40.A train has 482 people in the front coaches and 407 people in the back coaches. How many people are on the train?

Answer key

  1. 518
  2. 109
  3. 369
  4. 556
  5. 530
  6. 128
  7. 408
  8. 975
  9. 357
  10. 777
  11. 957
  12. 178
  13. 94
  14. 144
  15. 430
  16. 618
  17. 822
  18. 281
  19. 426
  20. 357
  21. 67
  22. 252
  23. 883
  24. 455
  25. 264
  26. 316
  27. 450
  28. 286
  29. 503
  30. 995
  31. 274
  32. 402
  33. 977
  34. 445
  35. 455
  36. 91
  37. 625
  38. 853
  39. 116
  40. 889

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