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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 969 · 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. 1.65?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.404? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?716 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 94 and take away the sum of its digits. What do you get?
  5. 5.?845 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 31 and take away the sum of its digits. What do you get?
  7. 7.32?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 22 and take away the sum of its digits. What do you get?
  9. 9.Take 72 and take away the sum of its digits. What do you get?
  10. 10.?956 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.277? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 85 and take away the sum of its digits. What do you get?
  13. 13.?676 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.2?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 30 and take away the sum of its digits. What do you get?
  16. 16.Take 51 and take away the sum of its digits. What do you get?
  17. 17.1?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 86 and take away the sum of its digits. What do you get?
  19. 19.61?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.7?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.5?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.28?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.140? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.88?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?132 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.7?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?538 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.6?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?349 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 14 and take away the sum of its digits. What do you get?
  32. 32.5?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 69 and take away the sum of its digits. What do you get?
  34. 34.?334 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.507? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.5?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 83 and take away the sum of its digits. What do you get?
  38. 38.38?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.6?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.233? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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