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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 606 · 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. 1.46?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 11 and take away the sum of its digits. What do you get?
  3. 3.66? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?235 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.5?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 85 and take away the sum of its digits. What do you get?
  7. 7.37? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?424 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 98 and take away the sum of its digits. What do you get?
  10. 10.Take 62 and take away the sum of its digits. What do you get?
  11. 11.?096 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.79?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.13?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.6?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.75?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?768 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 46 and take away the sum of its digits. What do you get?
  18. 18.1?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.15?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.48?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?707 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 99 and take away the sum of its digits. What do you get?
  23. 23.Take 66 and take away the sum of its digits. What do you get?
  24. 24.105? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?781 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.590? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.156? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?319 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.45?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 44 and take away the sum of its digits. What do you get?
  31. 31.Take 29 and take away the sum of its digits. What do you get?
  32. 32.?605 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.858? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.387? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.36?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.338? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?300 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 91 and take away the sum of its digits. What do you get?
  40. 40.Take 42 and take away the sum of its digits. What do you get?

Answer key

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

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