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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 276 · 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.A school has 617 children. 346 of them are girls. How many boys are there?
  2. 2.A school has 757 children. 633 of them are girls. How many boys are there?
  3. 3.A school has 496 children. 202 of them are girls. How many boys are there?
  4. 4.? − 740 = 71
  5. 5.405 + ? = 989
  6. 6.654 − 531 =
  7. 7.398 + 469 =
  8. 8.? + 452 = 896
  9. 9.659 + 209 =
  10. 10.A school has 391 children. 138 of them are girls. How many boys are there?
  11. 11.A train has 620 people in the front coaches and 197 people in the back coaches. How many people are on the train?
  12. 12.892 − 354 =
  13. 13.? − 165 = 175
  14. 14.215 + ? = 467
  15. 15.A school has 844 children. 609 of them are girls. How many boys are there?
  16. 16.? − 118 = 636
  17. 17.A train has 108 people in the front coaches and 744 people in the back coaches. How many people are on the train?
  18. 18.A school has 641 children. 530 of them are girls. How many boys are there?
  19. 19.A train has 369 people in the front coaches and 471 people in the back coaches. How many people are on the train?
  20. 20.A train has 200 people in the front coaches and 610 people in the back coaches. How many people are on the train?
  21. 21.454 − 264 =
  22. 22.A train has 198 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  23. 23.? − 189 = 177
  24. 24.793 + 148 =
  25. 25.445 − ? = 259
  26. 26.317 + 141 =
  27. 27.? − 162 = 104
  28. 28.611 − ? = 66
  29. 29.603 − ? = 455
  30. 30.? − 837 = 95
  31. 31.871 − ? = 741
  32. 32.A school has 208 children. 127 of them are girls. How many boys are there?
  33. 33.611 − 258 =
  34. 34.425 − ? = 74
  35. 35.640 − 108 =
  36. 36.523 − 212 =
  37. 37.366 + 276 =
  38. 38.A train has 651 people in the front coaches and 288 people in the back coaches. How many people are on the train?
  39. 39.757 − ? = 74
  40. 40.328 − 312 =

Answer key

  1. 271
  2. 124
  3. 294
  4. 811
  5. 584
  6. 123
  7. 867
  8. 444
  9. 868
  10. 253
  11. 817
  12. 538
  13. 340
  14. 252
  15. 235
  16. 754
  17. 852
  18. 111
  19. 840
  20. 810
  21. 190
  22. 464
  23. 366
  24. 941
  25. 186
  26. 458
  27. 266
  28. 545
  29. 148
  30. 932
  31. 130
  32. 81
  33. 353
  34. 351
  35. 532
  36. 311
  37. 642
  38. 939
  39. 683
  40. 16

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