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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 714 · 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 59 and take away the sum of its digits. What do you get?
  2. 2.Take 11 and take away the sum of its digits. What do you get?
  3. 3.Take 78 and take away the sum of its digits. What do you get?
  4. 4.Take 36 and take away the sum of its digits. What do you get?
  5. 5.63?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.6?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?363 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.67?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 28 and take away the sum of its digits. What do you get?
  10. 10.Take 40 and take away the sum of its digits. What do you get?
  11. 11.Take 92 and take away the sum of its digits. What do you get?
  12. 12.?003 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.32?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.8?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 61 and take away the sum of its digits. What do you get?
  16. 16.Take 60 and take away the sum of its digits. What do you get?
  17. 17.Take 75 and take away the sum of its digits. What do you get?
  18. 18.Take 27 and take away the sum of its digits. What do you get?
  19. 19.Take 86 and take away the sum of its digits. What do you get?
  20. 20.10?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.852? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?358 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.44? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.2?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.521? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.8?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.2?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 26 and take away the sum of its digits. What do you get?
  29. 29.Take 58 and take away the sum of its digits. What do you get?
  30. 30.Take 96 and take away the sum of its digits. What do you get?
  31. 31.Take 77 and take away the sum of its digits. What do you get?
  32. 32.Take 52 and take away the sum of its digits. What do you get?
  33. 33.416? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 88 and take away the sum of its digits. What do you get?
  35. 35.?617 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 79 and take away the sum of its digits. What do you get?
  37. 37.2?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?865 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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