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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 709 · 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. 1.557 + 339 =
  2. 2.A school has 269 children. 208 of them are girls. How many boys are there?
  3. 3.732 − 276 =
  4. 4.413 − 356 =
  5. 5.635 − ? = 221
  6. 6.562 + ? = 993
  7. 7.A school has 791 children. 516 of them are girls. How many boys are there?
  8. 8.236 + 681 =
  9. 9.354 + 359 =
  10. 10.? + 179 = 370
  11. 11.? + 667 = 823
  12. 12.899 − ? = 572
  13. 13.549 + 117 =
  14. 14.562 − ? = 68
  15. 15.A school has 916 children. 170 of them are girls. How many boys are there?
  16. 16.? − 363 = 634
  17. 17.483 + 485 =
  18. 18.A school has 866 children. 432 of them are girls. How many boys are there?
  19. 19.345 − 244 =
  20. 20.? + 202 = 446
  21. 21.462 − 431 =
  22. 22.365 + ? = 625
  23. 23.A school has 347 children. 250 of them are girls. How many boys are there?
  24. 24.573 − ? = 275
  25. 25.848 + ? = 964
  26. 26.? + 555 = 876
  27. 27.A train has 444 people in the front coaches and 257 people in the back coaches. How many people are on the train?
  28. 28.206 + 460 =
  29. 29.A train has 454 people in the front coaches and 425 people in the back coaches. How many people are on the train?
  30. 30.166 + ? = 554
  31. 31.536 + ? = 728
  32. 32.A school has 936 children. 107 of them are girls. How many boys are there?
  33. 33.? + 811 = 950
  34. 34.? + 479 = 909
  35. 35.? − 120 = 165
  36. 36.261 + ? = 500
  37. 37.651 + 186 =
  38. 38.422 − ? = 212
  39. 39.389 − 288 =
  40. 40.634 + 231 =

Answer key

  1. 896
  2. 61
  3. 456
  4. 57
  5. 414
  6. 431
  7. 275
  8. 917
  9. 713
  10. 191
  11. 156
  12. 327
  13. 666
  14. 494
  15. 746
  16. 997
  17. 968
  18. 434
  19. 101
  20. 244
  21. 31
  22. 260
  23. 97
  24. 298
  25. 116
  26. 321
  27. 701
  28. 666
  29. 879
  30. 388
  31. 192
  32. 829
  33. 139
  34. 430
  35. 285
  36. 239
  37. 837
  38. 210
  39. 101
  40. 865

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