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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 602 · 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. 1.745? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.173? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 54 and take away the sum of its digits. What do you get?
  4. 4.Take 38 and take away the sum of its digits. What do you get?
  5. 5.?186 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 92 and take away the sum of its digits. What do you get?
  7. 7.Take 12 and take away the sum of its digits. What do you get?
  8. 8.8?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 46 and take away the sum of its digits. What do you get?
  10. 10.588? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.877? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.6?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.4?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 24 and take away the sum of its digits. What do you get?
  15. 15.Take 59 and take away the sum of its digits. What do you get?
  16. 16.40?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.1?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.344? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?695 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.617? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.80?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 25 and take away the sum of its digits. What do you get?
  23. 23.?031 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.31?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?841 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 40 and take away the sum of its digits. What do you get?
  27. 27.482? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.797? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 44 and take away the sum of its digits. What do you get?
  30. 30.98? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.449? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 96 and take away the sum of its digits. What do you get?
  33. 33.Take 45 and take away the sum of its digits. What do you get?
  34. 34.871? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.1?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 18 and take away the sum of its digits. What do you get?
  37. 37.891? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 49 and take away the sum of its digits. What do you get?
  39. 39.509? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 13 and take away the sum of its digits. What do you get?

Answer key

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

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