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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 767 · 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. 1.74?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.481? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 28 and take away the sum of its digits. What do you get?
  4. 4.607? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 88 and take away the sum of its digits. What do you get?
  6. 6.?932 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.195? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.24?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 31 and take away the sum of its digits. What do you get?
  10. 10.?166 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?232 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 69 and take away the sum of its digits. What do you get?
  14. 14.Take 89 and take away the sum of its digits. What do you get?
  15. 15.Take 34 and take away the sum of its digits. What do you get?
  16. 16.?905 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?965 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 21 and take away the sum of its digits. What do you get?
  19. 19.Take 39 and take away the sum of its digits. What do you get?
  20. 20.601? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?024 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?078 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 53 and take away the sum of its digits. What do you get?
  25. 25.?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 62 and take away the sum of its digits. What do you get?
  27. 27.?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.5?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 87 and take away the sum of its digits. What do you get?
  30. 30.?939 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?377 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.7?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 97 and take away the sum of its digits. What do you get?
  34. 34.?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 73 and take away the sum of its digits. What do you get?
  36. 36.832? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 20 and take away the sum of its digits. What do you get?
  38. 38.2?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 33 and take away the sum of its digits. What do you get?
  40. 40.?457 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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