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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 833 · 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 62 and take away the sum of its digits. What do you get?
  2. 2.Take 85 and take away the sum of its digits. What do you get?
  3. 3.6?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?859 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 87 and take away the sum of its digits. What do you get?
  6. 6.?397 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 41 and take away the sum of its digits. What do you get?
  8. 8.?953 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 74 and take away the sum of its digits. What do you get?
  10. 10.?528 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.4?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?967 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 13 and take away the sum of its digits. What do you get?
  14. 14.2?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.304? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.1?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.67?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?139 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.2?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 20 and take away the sum of its digits. What do you get?
  21. 21.1?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?032 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.6?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 55 and take away the sum of its digits. What do you get?
  25. 25.4?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?209 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?110 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.1?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.52?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 91 and take away the sum of its digits. What do you get?
  31. 31.8?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?769 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.4?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?187 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 40 and take away the sum of its digits. What do you get?
  36. 36.683? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?202 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.432? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?881 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.685? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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