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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 63 · 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. 1.2?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 85 and take away the sum of its digits. What do you get?
  3. 3.7?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.546? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.634? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.60?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.80?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 94 and take away the sum of its digits. What do you get?
  9. 9.?296 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 61 and take away the sum of its digits. What do you get?
  11. 11.40?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.1?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.16?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 60 and take away the sum of its digits. What do you get?
  15. 15.Take 16 and take away the sum of its digits. What do you get?
  16. 16.?334 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.6?18 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 98 and take away the sum of its digits. What do you get?
  19. 19.1?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.3?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 79 and take away the sum of its digits. What do you get?
  23. 23.?521 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.6?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.54?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.702? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 74 and take away the sum of its digits. What do you get?
  28. 28.?905 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.8?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.1?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?709 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?713 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?064 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.6?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 75 and take away the sum of its digits. What do you get?
  36. 36.137? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.73?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 71 and take away the sum of its digits. What do you get?
  39. 39.876? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 57 and take away the sum of its digits. What do you get?

Answer key

  1. 6
  2. 72
  3. 9
  4. 3
  5. 5
  6. 3
  7. 6
  8. 81
  9. 1
  10. 54
  11. 7
  12. 1
  13. 4
  14. 54
  15. 9
  16. 8
  17. 3
  18. 81
  19. 1
  20. 6
  21. 8
  22. 63
  23. 1
  24. 1
  25. 2
  26. 9
  27. 63
  28. 4
  29. 1
  30. 4
  31. 2
  32. 7
  33. 8
  34. 5
  35. 63
  36. 7
  37. 7
  38. 63
  39. 6
  40. 45

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