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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 276 · 40 questions
TalentJR

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

NameDateTime takenScore ___ / 40
  1. 1.409? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.733? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.1?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?668 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 86 and take away the sum of its digits. What do you get?
  6. 6.3?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 14 and take away the sum of its digits. What do you get?
  8. 8.Take 90 and take away the sum of its digits. What do you get?
  9. 9.Take 76 and take away the sum of its digits. What do you get?
  10. 10.Take 39 and take away the sum of its digits. What do you get?
  11. 11.?803 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 55 and take away the sum of its digits. What do you get?
  13. 13.Take 62 and take away the sum of its digits. What do you get?
  14. 14.Take 95 and take away the sum of its digits. What do you get?
  15. 15.9?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?079 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?300 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 11 and take away the sum of its digits. What do you get?
  19. 19.Take 33 and take away the sum of its digits. What do you get?
  20. 20.?571 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.41?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?257 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 84 and take away the sum of its digits. What do you get?
  24. 24.Take 12 and take away the sum of its digits. What do you get?
  25. 25.Take 68 and take away the sum of its digits. What do you get?
  26. 26.Take 67 and take away the sum of its digits. What do you get?
  27. 27.8?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.30?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 29 and take away the sum of its digits. What do you get?
  30. 30.?548 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.37?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.478? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.60?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 44 and take away the sum of its digits. What do you get?
  35. 35.Take 69 and take away the sum of its digits. What do you get?
  36. 36.299? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.1?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.651? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.141? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 5
  2. 5
  3. 5
  4. 7
  5. 72
  6. 3
  7. 9
  8. 81
  9. 63
  10. 27
  11. 7
  12. 45
  13. 54
  14. 81
  15. 7
  16. 2
  17. 6
  18. 9
  19. 27
  20. 5
  21. 4
  22. 4
  23. 72
  24. 9
  25. 54
  26. 54
  27. 5
  28. 1
  29. 18
  30. 1
  31. 4
  32. 8
  33. 4
  34. 36
  35. 54
  36. 7
  37. 4
  38. 6
  39. 5
  40. 3

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