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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 237 · 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.?078 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.26?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.4?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.6?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?266 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 52 and take away the sum of its digits. What do you get?
  7. 7.Take 89 and take away the sum of its digits. What do you get?
  8. 8.10?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?965 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.833? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 69 and take away the sum of its digits. What do you get?
  12. 12.?332 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.76?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.7?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.4?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 41 and take away the sum of its digits. What do you get?
  18. 18.Take 93 and take away the sum of its digits. What do you get?
  19. 19.6?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 97 and take away the sum of its digits. What do you get?
  21. 21.1?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.7?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.65?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.68? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.2?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.30? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 43 and take away the sum of its digits. What do you get?
  29. 29.164? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.278? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 92 and take away the sum of its digits. What do you get?
  32. 32.?680 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.87? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.53?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?159 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?805 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.501? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 35 and take away the sum of its digits. What do you get?
  39. 39.Take 36 and take away the sum of its digits. What do you get?
  40. 40.Take 60 and take away the sum of its digits. What do you get?

Answer key

  1. 3
  2. 1
  3. 5
  4. 8
  5. 4
  6. 45
  7. 72
  8. 9
  9. 7
  10. 4
  11. 54
  12. 1
  13. 6
  14. 5
  15. 4
  16. 4
  17. 36
  18. 81
  19. 2
  20. 81
  21. 5
  22. 8
  23. 7
  24. 4
  25. 9
  26. 6
  27. 6
  28. 36
  29. 7
  30. 1
  31. 81
  32. 4
  33. 3
  34. 6
  35. 3
  36. 5
  37. 3
  38. 27
  39. 27
  40. 54

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