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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 527 · 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. 1.63?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 67 and take away the sum of its digits. What do you get?
  3. 3.Take 45 and take away the sum of its digits. What do you get?
  4. 4.?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 64 and take away the sum of its digits. What do you get?
  6. 6.Take 88 and take away the sum of its digits. What do you get?
  7. 7.Take 57 and take away the sum of its digits. What do you get?
  8. 8.?033 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.24?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 12 and take away the sum of its digits. What do you get?
  11. 11.2?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.61?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 94 and take away the sum of its digits. What do you get?
  14. 14.Take 37 and take away the sum of its digits. What do you get?
  15. 15.16?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 23 and take away the sum of its digits. What do you get?
  17. 17.Take 13 and take away the sum of its digits. What do you get?
  18. 18.54?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.82?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.732? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 55 and take away the sum of its digits. What do you get?
  22. 22.Take 40 and take away the sum of its digits. What do you get?
  23. 23.1?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.3?79 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.2?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?302 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?778 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?526 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.408? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 20 and take away the sum of its digits. What do you get?
  31. 31.602? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.27?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.8?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?593 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.335? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.370? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 73 and take away the sum of its digits. What do you get?
  38. 38.Take 80 and take away the sum of its digits. What do you get?
  39. 39.?008 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 66 and take away the sum of its digits. What do you get?

Answer key

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

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