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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 468 · 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. 1.605 + ? = 712
  2. 2.486 − ? = 381
  3. 3.644 − 409 =
  4. 4.345 − 159 =
  5. 5.303 + 281 =
  6. 6.399 − 186 =
  7. 7.A train has 837 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  8. 8.119 + 851 =
  9. 9.441 + 490 =
  10. 10.892 − 736 =
  11. 11.A train has 431 people in the front coaches and 318 people in the back coaches. How many people are on the train?
  12. 12.783 − 388 =
  13. 13.? − 145 = 400
  14. 14.374 + 282 =
  15. 15.A train has 554 people in the front coaches and 198 people in the back coaches. How many people are on the train?
  16. 16.A train has 860 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  17. 17.A school has 895 children. 494 of them are girls. How many boys are there?
  18. 18.A school has 880 children. 321 of them are girls. How many boys are there?
  19. 19.A school has 445 children. 302 of them are girls. How many boys are there?
  20. 20.663 + 324 =
  21. 21.992 − 759 =
  22. 22.A train has 132 people in the front coaches and 751 people in the back coaches. How many people are on the train?
  23. 23.235 − 211 =
  24. 24.332 + 545 =
  25. 25.610 − ? = 472
  26. 26.A school has 355 children. 266 of them are girls. How many boys are there?
  27. 27.? + 407 = 763
  28. 28.135 + 543 =
  29. 29.287 − 256 =
  30. 30.279 − 230 =
  31. 31.A school has 250 children. 225 of them are girls. How many boys are there?
  32. 32.? + 536 = 873
  33. 33.472 + 413 =
  34. 34.? + 174 = 571
  35. 35.288 + 288 =
  36. 36.? + 129 = 931
  37. 37.250 + ? = 579
  38. 38.799 − ? = 510
  39. 39.769 + 110 =
  40. 40.772 + 132 =

Answer key

  1. 107
  2. 105
  3. 235
  4. 186
  5. 584
  6. 213
  7. 940
  8. 970
  9. 931
  10. 156
  11. 749
  12. 395
  13. 545
  14. 656
  15. 752
  16. 996
  17. 401
  18. 559
  19. 143
  20. 987
  21. 233
  22. 883
  23. 24
  24. 877
  25. 138
  26. 89
  27. 356
  28. 678
  29. 31
  30. 49
  31. 25
  32. 337
  33. 885
  34. 397
  35. 576
  36. 802
  37. 329
  38. 289
  39. 879
  40. 904

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