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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 961 · 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. 1.2?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.5?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.483? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?464 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?750 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.46?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.7?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.30?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.841? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.166? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.8?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 36 and take away the sum of its digits. What do you get?
  13. 13.Take 15 and take away the sum of its digits. What do you get?
  14. 14.?679 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 31 and take away the sum of its digits. What do you get?
  16. 16.Take 60 and take away the sum of its digits. What do you get?
  17. 17.?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.40?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.5?18 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.752? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.4?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.536? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.61?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.2?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.7?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 32 and take away the sum of its digits. What do you get?
  27. 27.?111 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 55 and take away the sum of its digits. What do you get?
  29. 29.?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 97 and take away the sum of its digits. What do you get?
  31. 31.Take 38 and take away the sum of its digits. What do you get?
  32. 32.789? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?518 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.641? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 17 and take away the sum of its digits. What do you get?
  36. 36.25?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.2?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.64?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.22?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.476? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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