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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 376 · 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.Take 46 and take away the sum of its digits. What do you get?
  2. 2.Take 15 and take away the sum of its digits. What do you get?
  3. 3.?948 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.80? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 93 and take away the sum of its digits. What do you get?
  6. 6.5?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 78 and take away the sum of its digits. What do you get?
  8. 8.68?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.583? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.605? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 70 and take away the sum of its digits. What do you get?
  12. 12.81?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.86?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.7?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 29 and take away the sum of its digits. What do you get?
  16. 16.72?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?785 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?093 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 69 and take away the sum of its digits. What do you get?
  20. 20.?248 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.408? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.31? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.1?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.32?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 39 and take away the sum of its digits. What do you get?
  27. 27.87?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 24 and take away the sum of its digits. What do you get?
  29. 29.4?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.19?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.8?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 37 and take away the sum of its digits. What do you get?
  33. 33.1?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?446 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 61 and take away the sum of its digits. What do you get?
  37. 37.?449 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.817? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?339 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.8?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 36
  2. 9
  3. 6
  4. 1
  5. 81
  6. 7
  7. 63
  8. 9
  9. 2
  10. 7
  11. 63
  12. 9
  13. 6
  14. 3
  15. 18
  16. 2
  17. 7
  18. 6
  19. 54
  20. 4
  21. 9
  22. 6
  23. 5
  24. 2
  25. 2
  26. 27
  27. 8
  28. 18
  29. 7
  30. 7
  31. 7
  32. 27
  33. 6
  34. 6
  35. 4
  36. 54
  37. 1
  38. 2
  39. 3
  40. 1

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