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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 748 · 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. 1.374? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?278 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.771? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.4?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 95 and take away the sum of its digits. What do you get?
  6. 6.48? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?151 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.8?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.699? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 58 and take away the sum of its digits. What do you get?
  11. 11.101? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 39 and take away the sum of its digits. What do you get?
  13. 13.Take 43 and take away the sum of its digits. What do you get?
  14. 14.?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.175? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.14?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?362 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 38 and take away the sum of its digits. What do you get?
  19. 19.38?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?805 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 34 and take away the sum of its digits. What do you get?
  22. 22.?719 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 24 and take away the sum of its digits. What do you get?
  24. 24.?358 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 98 and take away the sum of its digits. What do you get?
  26. 26.4?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?694 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?374 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 31 and take away the sum of its digits. What do you get?
  30. 30.8?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.42?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.5?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.690? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?569 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?915 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.583? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.29?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?470 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 57 and take away the sum of its digits. What do you get?

Answer key

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

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