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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 962 · 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.?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?907 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?517 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.3?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?335 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?176 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?678 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.6?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?508 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.18?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.4?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?267 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.58?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.2?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?647 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.44?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 82 and take away the sum of its digits. What do you get?
  18. 18.?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.4?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.296? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?443 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.865? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?039 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 26 and take away the sum of its digits. What do you get?
  26. 26.Take 72 and take away the sum of its digits. What do you get?
  27. 27.Take 71 and take away the sum of its digits. What do you get?
  28. 28.Take 24 and take away the sum of its digits. What do you get?
  29. 29.Take 99 and take away the sum of its digits. What do you get?
  30. 30.5?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.86?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?102 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.27?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 34 and take away the sum of its digits. What do you get?
  35. 35.?658 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.3?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 54 and take away the sum of its digits. What do you get?
  38. 38.Take 90 and take away the sum of its digits. What do you get?
  39. 39.27? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 18 and take away the sum of its digits. What do you get?

Answer key

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

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