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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 525 · 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.?095 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 14 and take away the sum of its digits. What do you get?
  3. 3.?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?776 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.7?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 30 and take away the sum of its digits. What do you get?
  7. 7.?029 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.5?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.742? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?133 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.7?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?975 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?530 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?386 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.2?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?448 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.41?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.2?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?501 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 70 and take away the sum of its digits. What do you get?
  21. 21.756? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.197? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.6?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 46 and take away the sum of its digits. What do you get?
  25. 25.?680 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.5?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?278 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.622? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.39? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 43 and take away the sum of its digits. What do you get?
  31. 31.Take 89 and take away the sum of its digits. What do you get?
  32. 32.Take 56 and take away the sum of its digits. What do you get?
  33. 33.Take 48 and take away the sum of its digits. What do you get?
  34. 34.664? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 64 and take away the sum of its digits. What do you get?
  37. 37.55?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?003 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.42?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 13 and take away the sum of its digits. What do you get?

Answer key

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

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