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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 173 · 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. 1.304 − ? = 160
  2. 2.754 − 107 =
  3. 3.404 − 359 =
  4. 4.732 + 243 =
  5. 5.148 + ? = 692
  6. 6.A school has 313 children. 277 of them are girls. How many boys are there?
  7. 7.204 − 105 =
  8. 8.597 + 173 =
  9. 9.A train has 177 people in the front coaches and 623 people in the back coaches. How many people are on the train?
  10. 10.? − 162 = 783
  11. 11.382 + 198 =
  12. 12.A train has 528 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  13. 13.656 − 246 =
  14. 14.362 + 409 =
  15. 15.A school has 516 children. 417 of them are girls. How many boys are there?
  16. 16.735 + 169 =
  17. 17.? − 830 = 146
  18. 18.848 − ? = 402
  19. 19.619 − 100 =
  20. 20.? + 640 = 809
  21. 21.244 − ? = 72
  22. 22.A school has 530 children. 111 of them are girls. How many boys are there?
  23. 23.559 − 288 =
  24. 24.654 + 311 =
  25. 25.? − 383 = 88
  26. 26.A school has 581 children. 182 of them are girls. How many boys are there?
  27. 27.? − 391 = 153
  28. 28.597 − ? = 495
  29. 29.372 − 189 =
  30. 30.A school has 233 children. 109 of them are girls. How many boys are there?
  31. 31.? − 103 = 301
  32. 32.A school has 356 children. 107 of them are girls. How many boys are there?
  33. 33.A school has 303 children. 134 of them are girls. How many boys are there?
  34. 34.A train has 152 people in the front coaches and 351 people in the back coaches. How many people are on the train?
  35. 35.674 − ? = 313
  36. 36.415 + ? = 611
  37. 37.A train has 207 people in the front coaches and 423 people in the back coaches. How many people are on the train?
  38. 38.A train has 436 people in the front coaches and 371 people in the back coaches. How many people are on the train?
  39. 39.A train has 254 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  40. 40.? + 595 = 993

Answer key

  1. 144
  2. 647
  3. 45
  4. 975
  5. 544
  6. 36
  7. 99
  8. 770
  9. 800
  10. 945
  11. 580
  12. 631
  13. 410
  14. 771
  15. 99
  16. 904
  17. 976
  18. 446
  19. 519
  20. 169
  21. 172
  22. 419
  23. 271
  24. 965
  25. 471
  26. 399
  27. 544
  28. 102
  29. 183
  30. 124
  31. 404
  32. 249
  33. 169
  34. 503
  35. 361
  36. 196
  37. 630
  38. 807
  39. 407
  40. 398

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