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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 336 · 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 26 and take away the sum of its digits. What do you get?
  2. 2.?151 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?268 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?660 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.35?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.2?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 95 and take away the sum of its digits. What do you get?
  8. 8.Take 77 and take away the sum of its digits. What do you get?
  9. 9.?033 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.1?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 46 and take away the sum of its digits. What do you get?
  13. 13.62?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.389? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.305? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.3?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.7?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?728 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 67 and take away the sum of its digits. What do you get?
  21. 21.?323 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.17?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 69 and take away the sum of its digits. What do you get?
  24. 24.Take 88 and take away the sum of its digits. What do you get?
  25. 25.196? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.345? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.74?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.53?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 16 and take away the sum of its digits. What do you get?
  30. 30.79?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.78? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 86 and take away the sum of its digits. What do you get?
  33. 33.?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.8?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?346 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.6?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?088 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?665 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.70?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 19 and take away the sum of its digits. What do you get?

Answer key

  1. 18
  2. 2
  3. 2
  4. 6
  5. 1
  6. 1
  7. 81
  8. 63
  9. 3
  10. 4
  11. 8
  12. 36
  13. 9
  14. 7
  15. 2
  16. 1
  17. 3
  18. 5
  19. 1
  20. 54
  21. 1
  22. 5
  23. 54
  24. 72
  25. 2
  26. 6
  27. 7
  28. 8
  29. 9
  30. 7
  31. 3
  32. 72
  33. 5
  34. 5
  35. 5
  36. 5
  37. 2
  38. 1
  39. 9
  40. 9

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