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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 261 · 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. 1.5?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.46?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.20?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?629 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 57 and take away the sum of its digits. What do you get?
  6. 6.3?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.63?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 40 and take away the sum of its digits. What do you get?
  9. 9.6?79 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 63 and take away the sum of its digits. What do you get?
  12. 12.Take 28 and take away the sum of its digits. What do you get?
  13. 13.?515 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 50 and take away the sum of its digits. What do you get?
  15. 15.Take 26 and take away the sum of its digits. What do you get?
  16. 16.7?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.821? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?911 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 47 and take away the sum of its digits. What do you get?
  20. 20.863? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 64 and take away the sum of its digits. What do you get?
  22. 22.32? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 31 and take away the sum of its digits. What do you get?
  24. 24.Take 17 and take away the sum of its digits. What do you get?
  25. 25.92? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 94 and take away the sum of its digits. What do you get?
  27. 27.8?38 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?662 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 53 and take away the sum of its digits. What do you get?
  30. 30.51? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.1?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 65 and take away the sum of its digits. What do you get?
  33. 33.79?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?980 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 32 and take away the sum of its digits. What do you get?
  36. 36.7?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 48 and take away the sum of its digits. What do you get?
  38. 38.Take 22 and take away the sum of its digits. What do you get?
  39. 39.564? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 70 and take away the sum of its digits. What do you get?

Answer key

  1. 3
  2. 9
  3. 6
  4. 1
  5. 45
  6. 1
  7. 6
  8. 36
  9. 5
  10. 3
  11. 54
  12. 18
  13. 7
  14. 45
  15. 18
  16. 1
  17. 7
  18. 7
  19. 36
  20. 1
  21. 54
  22. 4
  23. 27
  24. 9
  25. 7
  26. 81
  27. 8
  28. 4
  29. 45
  30. 3
  31. 2
  32. 54
  33. 6
  34. 1
  35. 27
  36. 2
  37. 36
  38. 18
  39. 3
  40. 63

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