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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 416 · 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. 1.24?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.683? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 48 and take away the sum of its digits. What do you get?
  5. 5.?359 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?206 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.270? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.57?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.251? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.877? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 96 and take away the sum of its digits. What do you get?
  12. 12.815? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 78 and take away the sum of its digits. What do you get?
  14. 14.551? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.14? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.2?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.5?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 63 and take away the sum of its digits. What do you get?
  20. 20.Take 18 and take away the sum of its digits. What do you get?
  21. 21.?060 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?437 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.6?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.704? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?760 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?611 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 67 and take away the sum of its digits. What do you get?
  28. 28.10?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?380 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.44?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 53 and take away the sum of its digits. What do you get?
  33. 33.299? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?013 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?530 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.6?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.72?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?987 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 87 and take away the sum of its digits. What do you get?
  40. 40.2?87 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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