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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 491 · 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. 1.499 + 371 =
  2. 2.977 − 743 =
  3. 3.839 − ? = 722
  4. 4.620 + 320 =
  5. 5.A school has 498 children. 400 of them are girls. How many boys are there?
  6. 6.309 + 233 =
  7. 7.693 + 182 =
  8. 8.A train has 609 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  9. 9.? − 541 = 285
  10. 10.A school has 312 children. 254 of them are girls. How many boys are there?
  11. 11.A school has 631 children. 164 of them are girls. How many boys are there?
  12. 12.A train has 720 people in the front coaches and 231 people in the back coaches. How many people are on the train?
  13. 13.238 − 174 =
  14. 14.A school has 356 children. 155 of them are girls. How many boys are there?
  15. 15.A train has 392 people in the front coaches and 374 people in the back coaches. How many people are on the train?
  16. 16.A school has 740 children. 292 of them are girls. How many boys are there?
  17. 17.A train has 226 people in the front coaches and 409 people in the back coaches. How many people are on the train?
  18. 18.A school has 789 children. 338 of them are girls. How many boys are there?
  19. 19.? − 210 = 14
  20. 20.? + 899 = 999
  21. 21.573 − 376 =
  22. 22.533 − ? = 47
  23. 23.940 − 751 =
  24. 24.465 − 105 =
  25. 25.745 + 100 =
  26. 26.A train has 675 people in the front coaches and 192 people in the back coaches. How many people are on the train?
  27. 27.871 − ? = 270
  28. 28.A school has 936 children. 827 of them are girls. How many boys are there?
  29. 29.837 + 123 =
  30. 30.A school has 681 children. 576 of them are girls. How many boys are there?
  31. 31.534 − ? = 340
  32. 32.? + 311 = 824
  33. 33.598 − ? = 7
  34. 34.A school has 255 children. 172 of them are girls. How many boys are there?
  35. 35.A train has 525 people in the front coaches and 162 people in the back coaches. How many people are on the train?
  36. 36.A train has 831 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  37. 37.? − 635 = 298
  38. 38.? − 162 = 170
  39. 39.568 − ? = 296
  40. 40.A school has 728 children. 242 of them are girls. How many boys are there?

Answer key

  1. 870
  2. 234
  3. 117
  4. 940
  5. 98
  6. 542
  7. 875
  8. 885
  9. 826
  10. 58
  11. 467
  12. 951
  13. 64
  14. 201
  15. 766
  16. 448
  17. 635
  18. 451
  19. 224
  20. 100
  21. 197
  22. 486
  23. 189
  24. 360
  25. 845
  26. 867
  27. 601
  28. 109
  29. 960
  30. 105
  31. 194
  32. 513
  33. 591
  34. 83
  35. 687
  36. 935
  37. 933
  38. 332
  39. 272
  40. 486

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