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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 821 · 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. 1.52?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.300? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.56?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 76 and take away the sum of its digits. What do you get?
  5. 5.?500 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?059 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?646 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.8?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.1?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 16 and take away the sum of its digits. What do you get?
  12. 12.?984 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?256 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.64?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.455? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 75 and take away the sum of its digits. What do you get?
  18. 18.152? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.2?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?020 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.2?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.60?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.282? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?037 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.738? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?929 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.80?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 44 and take away the sum of its digits. What do you get?
  30. 30.268? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?934 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.72?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?150 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.19?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.24?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.742? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?240 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 66 and take away the sum of its digits. What do you get?
  39. 39.Take 80 and take away the sum of its digits. What do you get?
  40. 40.?709 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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