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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 694 · 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. 1.424 − 420 =
  2. 2.630 + ? = 799
  3. 3.144 + ? = 260
  4. 4.364 − 347 =
  5. 5.A train has 217 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  6. 6.A school has 733 children. 674 of them are girls. How many boys are there?
  7. 7.? + 523 = 717
  8. 8.790 + ? = 947
  9. 9.A school has 684 children. 284 of them are girls. How many boys are there?
  10. 10.? − 103 = 121
  11. 11.629 − ? = 501
  12. 12.250 + 538 =
  13. 13.A school has 446 children. 131 of them are girls. How many boys are there?
  14. 14.469 + 274 =
  15. 15.A school has 637 children. 372 of them are girls. How many boys are there?
  16. 16.A school has 486 children. 250 of them are girls. How many boys are there?
  17. 17.281 − 104 =
  18. 18.577 + ? = 875
  19. 19.693 + 197 =
  20. 20.238 + ? = 772
  21. 21.? − 218 = 280
  22. 22.? − 234 = 76
  23. 23.A train has 757 people in the front coaches and 234 people in the back coaches. How many people are on the train?
  24. 24.988 − 527 =
  25. 25.674 + 296 =
  26. 26.141 + 232 =
  27. 27.534 − 216 =
  28. 28.? − 235 = 385
  29. 29.208 + 297 =
  30. 30.A train has 818 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  31. 31.539 + 181 =
  32. 32.339 − ? = 118
  33. 33.306 + ? = 740
  34. 34.A train has 397 people in the front coaches and 330 people in the back coaches. How many people are on the train?
  35. 35.? + 688 = 821
  36. 36.A train has 344 people in the front coaches and 419 people in the back coaches. How many people are on the train?
  37. 37.389 − 113 =
  38. 38.566 + ? = 886
  39. 39.586 − 560 =
  40. 40.470 − ? = 94

Answer key

  1. 4
  2. 169
  3. 116
  4. 17
  5. 370
  6. 59
  7. 194
  8. 157
  9. 400
  10. 224
  11. 128
  12. 788
  13. 315
  14. 743
  15. 265
  16. 236
  17. 177
  18. 298
  19. 890
  20. 534
  21. 498
  22. 310
  23. 991
  24. 461
  25. 970
  26. 373
  27. 318
  28. 620
  29. 505
  30. 998
  31. 720
  32. 221
  33. 434
  34. 727
  35. 133
  36. 763
  37. 276
  38. 320
  39. 26
  40. 376

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