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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 792 · 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?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?292 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?735 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.71?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 47 and take away the sum of its digits. What do you get?
  6. 6.?152 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.6?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 17 and take away the sum of its digits. What do you get?
  9. 9.Take 68 and take away the sum of its digits. What do you get?
  10. 10.35? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 89 and take away the sum of its digits. What do you get?
  12. 12.4?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.2?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?214 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.8?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 87 and take away the sum of its digits. What do you get?
  18. 18.Take 19 and take away the sum of its digits. What do you get?
  19. 19.Take 39 and take away the sum of its digits. What do you get?
  20. 20.Take 67 and take away the sum of its digits. What do you get?
  21. 21.Take 30 and take away the sum of its digits. What do you get?
  22. 22.Take 15 and take away the sum of its digits. What do you get?
  23. 23.56?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 88 and take away the sum of its digits. What do you get?
  25. 25.?616 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.140? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.6?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 79 and take away the sum of its digits. What do you get?
  29. 29.Take 73 and take away the sum of its digits. What do you get?
  30. 30.Take 83 and take away the sum of its digits. What do you get?
  31. 31.?440 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?494 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 33 and take away the sum of its digits. What do you get?
  34. 34.20?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?646 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.598? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 84 and take away the sum of its digits. What do you get?
  38. 38.49?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.63?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?289 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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