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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 169 · 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. 1.354? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.65? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 84 and take away the sum of its digits. What do you get?
  4. 4.?019 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.806? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.32?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 65 and take away the sum of its digits. What do you get?
  8. 8.7?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 61 and take away the sum of its digits. What do you get?
  10. 10.Take 36 and take away the sum of its digits. What do you get?
  11. 11.31?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.38?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?028 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 31 and take away the sum of its digits. What do you get?
  15. 15.59?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.234? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?065 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 90 and take away the sum of its digits. What do you get?
  19. 19.2?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 64 and take away the sum of its digits. What do you get?
  21. 21.6?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 19 and take away the sum of its digits. What do you get?
  23. 23.76?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.4?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.88?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.8?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.154? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.6?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.4?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 56 and take away the sum of its digits. What do you get?
  31. 31.20?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 24 and take away the sum of its digits. What do you get?
  33. 33.Take 96 and take away the sum of its digits. What do you get?
  34. 34.4?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.1?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 34 and take away the sum of its digits. What do you get?
  37. 37.Take 23 and take away the sum of its digits. What do you get?
  38. 38.?807 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.54?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.67?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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