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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 581 · 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. 1.4?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?368 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?577 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.24?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 54 and take away the sum of its digits. What do you get?
  6. 6.87?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?272 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?466 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.5?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 25 and take away the sum of its digits. What do you get?
  11. 11.?708 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 62 and take away the sum of its digits. What do you get?
  13. 13.Take 28 and take away the sum of its digits. What do you get?
  14. 14.1?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 87 and take away the sum of its digits. What do you get?
  16. 16.Take 49 and take away the sum of its digits. What do you get?
  17. 17.?825 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.81?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.80?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.5?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.345? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 29 and take away the sum of its digits. What do you get?
  23. 23.?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?583 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?076 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.5?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 61 and take away the sum of its digits. What do you get?
  28. 28.296? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 88 and take away the sum of its digits. What do you get?
  30. 30.4?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.734? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.72?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 17 and take away the sum of its digits. What do you get?
  34. 34.19?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 45 and take away the sum of its digits. What do you get?
  36. 36.?703 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.414? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?637 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.778? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.6?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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