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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 749 · 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. 1.776? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.15?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?924 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.13?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.250? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?894 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.1?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 28 and take away the sum of its digits. What do you get?
  9. 9.Take 77 and take away the sum of its digits. What do you get?
  10. 10.Take 94 and take away the sum of its digits. What do you get?
  11. 11.3?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 48 and take away the sum of its digits. What do you get?
  13. 13.Take 46 and take away the sum of its digits. What do you get?
  14. 14.Take 29 and take away the sum of its digits. What do you get?
  15. 15.?214 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?257 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.14?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.6?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 36 and take away the sum of its digits. What do you get?
  20. 20.?215 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.8?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.16?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.48?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 50 and take away the sum of its digits. What do you get?
  25. 25.63?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 96 and take away the sum of its digits. What do you get?
  27. 27.Take 32 and take away the sum of its digits. What do you get?
  28. 28.18?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 85 and take away the sum of its digits. What do you get?
  30. 30.?547 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.823? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 20 and take away the sum of its digits. What do you get?
  33. 33.Take 25 and take away the sum of its digits. What do you get?
  34. 34.Take 56 and take away the sum of its digits. What do you get?
  35. 35.?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.1?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.64?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 57 and take away the sum of its digits. What do you get?
  39. 39.Take 99 and take away the sum of its digits. What do you get?
  40. 40.?353 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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