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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 745 · 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.?022 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?826 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.706? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.2?18 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 19 and take away the sum of its digits. What do you get?
  6. 6.576? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?233 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 42 and take away the sum of its digits. What do you get?
  9. 9.Take 96 and take away the sum of its digits. What do you get?
  10. 10.Take 98 and take away the sum of its digits. What do you get?
  11. 11.6?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.5?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.17?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.4?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 75 and take away the sum of its digits. What do you get?
  16. 16.74?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.522? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 55 and take away the sum of its digits. What do you get?
  19. 19.89?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.636? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?116 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.86?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.68?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.8?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?487 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 22 and take away the sum of its digits. What do you get?
  28. 28.Take 45 and take away the sum of its digits. What do you get?
  29. 29.?712 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 44 and take away the sum of its digits. What do you get?
  31. 31.?316 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.22?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 57 and take away the sum of its digits. What do you get?
  34. 34.134? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.258? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 25 and take away the sum of its digits. What do you get?
  37. 37.555? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 18 and take away the sum of its digits. What do you get?
  39. 39.4?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 72 and take away the sum of its digits. What do you get?

Answer key

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

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