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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 703 · 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.Take 69 and take away the sum of its digits. What do you get?
  2. 2.?132 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 28 and take away the sum of its digits. What do you get?
  4. 4.691? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.45?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?096 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.575? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.220? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?687 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 87 and take away the sum of its digits. What do you get?
  12. 12.?827 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?700 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.839? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.757? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 60 and take away the sum of its digits. What do you get?
  17. 17.67?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 12 and take away the sum of its digits. What do you get?
  20. 20.40?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.302? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.7?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.730? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 95 and take away the sum of its digits. What do you get?
  25. 25.?986 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?869 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 26 and take away the sum of its digits. What do you get?
  28. 28.?376 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 17 and take away the sum of its digits. What do you get?
  30. 30.?335 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.858? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 55 and take away the sum of its digits. What do you get?
  33. 33.Take 38 and take away the sum of its digits. What do you get?
  34. 34.261? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.48?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 66 and take away the sum of its digits. What do you get?
  37. 37.3?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 58 and take away the sum of its digits. What do you get?
  39. 39.?825 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?895 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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