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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 206 · 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?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.60? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.48?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 57 and take away the sum of its digits. What do you get?
  5. 5.22?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.1?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 87 and take away the sum of its digits. What do you get?
  8. 8.8?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.581? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.2?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?281 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.375? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.1?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 18 and take away the sum of its digits. What do you get?
  15. 15.?361 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.16? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 52 and take away the sum of its digits. What do you get?
  18. 18.Take 48 and take away the sum of its digits. What do you get?
  19. 19.565? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.37?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.31?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?667 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 91 and take away the sum of its digits. What do you get?
  24. 24.849? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.75?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.32?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?092 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 36 and take away the sum of its digits. What do you get?
  29. 29.57?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 70 and take away the sum of its digits. What do you get?
  31. 31.Take 67 and take away the sum of its digits. What do you get?
  32. 32.Take 82 and take away the sum of its digits. What do you get?
  33. 33.6?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.6?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.58? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.1?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 23 and take away the sum of its digits. What do you get?
  38. 38.Take 33 and take away the sum of its digits. What do you get?
  39. 39.1?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 31 and take away the sum of its digits. What do you get?

Answer key

  1. 1
  2. 3
  3. 3
  4. 45
  5. 3
  6. 9
  7. 72
  8. 9
  9. 4
  10. 2
  11. 7
  12. 3
  13. 9
  14. 9
  15. 8
  16. 2
  17. 45
  18. 36
  19. 2
  20. 2
  21. 6
  22. 8
  23. 81
  24. 6
  25. 7
  26. 8
  27. 7
  28. 27
  29. 3
  30. 63
  31. 54
  32. 72
  33. 6
  34. 5
  35. 5
  36. 7
  37. 18
  38. 27
  39. 7
  40. 27

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