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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 323 · 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. 1.793? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 52 and take away the sum of its digits. What do you get?
  3. 3.76?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.612? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.13?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 60 and take away the sum of its digits. What do you get?
  7. 7.14?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.32? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.7?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.64?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 62 and take away the sum of its digits. What do you get?
  12. 12.253? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 20 and take away the sum of its digits. What do you get?
  14. 14.19?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?923 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.240? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.4?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.458? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 64 and take away the sum of its digits. What do you get?
  20. 20.Take 89 and take away the sum of its digits. What do you get?
  21. 21.69?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.4?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?062 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.301? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.810? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?485 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 18 and take away the sum of its digits. What do you get?
  28. 28.746? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?780 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.613? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.690? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.86?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?430 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 74 and take away the sum of its digits. What do you get?
  35. 35.?301 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 81 and take away the sum of its digits. What do you get?
  37. 37.770? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.196? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 49 and take away the sum of its digits. What do you get?

Answer key

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

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