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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 322 · 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. 1.1?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?332 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.800? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.2?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.537? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.201? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?556 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?186 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.2?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 63 and take away the sum of its digits. What do you get?
  11. 11.?716 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 66 and take away the sum of its digits. What do you get?
  13. 13.7?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 37 and take away the sum of its digits. What do you get?
  15. 15.?336 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?778 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.3?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 27 and take away the sum of its digits. What do you get?
  19. 19.Take 42 and take away the sum of its digits. What do you get?
  20. 20.4?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?865 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.17?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.4?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 14 and take away the sum of its digits. What do you get?
  25. 25.4?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 21 and take away the sum of its digits. What do you get?
  27. 27.60?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?205 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.57?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 61 and take away the sum of its digits. What do you get?
  31. 31.Take 52 and take away the sum of its digits. What do you get?
  32. 32.Take 11 and take away the sum of its digits. What do you get?
  33. 33.Take 89 and take away the sum of its digits. What do you get?
  34. 34.Take 19 and take away the sum of its digits. What do you get?
  35. 35.?554 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.5?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 94 and take away the sum of its digits. What do you get?
  38. 38.88?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.18? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?681 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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