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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 449 · 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.? + 321 = 449
  2. 2.386 − ? = 245
  3. 3.634 + 362 =
  4. 4.A school has 285 children. 278 of them are girls. How many boys are there?
  5. 5.146 + 417 =
  6. 6.A school has 444 children. 365 of them are girls. How many boys are there?
  7. 7.A school has 544 children. 204 of them are girls. How many boys are there?
  8. 8.? − 307 = 175
  9. 9.? + 826 = 989
  10. 10.A train has 671 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  11. 11.? + 631 = 984
  12. 12.512 + 341 =
  13. 13.219 − ? = 100
  14. 14.A train has 317 people in the front coaches and 350 people in the back coaches. How many people are on the train?
  15. 15.? + 109 = 395
  16. 16.A school has 716 children. 481 of them are girls. How many boys are there?
  17. 17.A train has 608 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  18. 18.601 − 489 =
  19. 19.535 + 200 =
  20. 20.414 + ? = 516
  21. 21.192 + 646 =
  22. 22.104 + 506 =
  23. 23.484 + 359 =
  24. 24.A school has 516 children. 241 of them are girls. How many boys are there?
  25. 25.401 − 127 =
  26. 26.545 − 165 =
  27. 27.A school has 847 children. 669 of them are girls. How many boys are there?
  28. 28.? + 449 = 765
  29. 29.A school has 235 children. 220 of them are girls. How many boys are there?
  30. 30.A train has 373 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  31. 31.761 − 102 =
  32. 32.? + 619 = 735
  33. 33.A train has 613 people in the front coaches and 211 people in the back coaches. How many people are on the train?
  34. 34.A train has 384 people in the front coaches and 175 people in the back coaches. How many people are on the train?
  35. 35.462 + ? = 742
  36. 36.? − 457 = 317
  37. 37.212 − 183 =
  38. 38.A school has 417 children. 249 of them are girls. How many boys are there?
  39. 39.A train has 110 people in the front coaches and 223 people in the back coaches. How many people are on the train?
  40. 40.A train has 765 people in the front coaches and 169 people in the back coaches. How many people are on the train?

Answer key

  1. 128
  2. 141
  3. 996
  4. 7
  5. 563
  6. 79
  7. 340
  8. 482
  9. 163
  10. 820
  11. 353
  12. 853
  13. 119
  14. 667
  15. 286
  16. 235
  17. 749
  18. 112
  19. 735
  20. 102
  21. 838
  22. 610
  23. 843
  24. 275
  25. 274
  26. 380
  27. 178
  28. 316
  29. 15
  30. 477
  31. 659
  32. 116
  33. 824
  34. 559
  35. 280
  36. 774
  37. 29
  38. 168
  39. 333
  40. 934

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