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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 853 · 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 37 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.Take 75 and take away the sum of its digits. What do you get?
  4. 4.26?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 95 and take away the sum of its digits. What do you get?
  7. 7.?593 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.2?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.37? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.58?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.70?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 33 and take away the sum of its digits. What do you get?
  13. 13.?350 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.5?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.531? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?223 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 71 and take away the sum of its digits. What do you get?
  18. 18.Take 32 and take away the sum of its digits. What do you get?
  19. 19.2?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 63 and take away the sum of its digits. What do you get?
  21. 21.?833 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.8?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 88 and take away the sum of its digits. What do you get?
  24. 24.Take 96 and take away the sum of its digits. What do you get?
  25. 25.43?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?390 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 93 and take away the sum of its digits. What do you get?
  28. 28.723? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 40 and take away the sum of its digits. What do you get?
  30. 30.212? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.7?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.8?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.39?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?283 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 13 and take away the sum of its digits. What do you get?
  36. 36.Take 22 and take away the sum of its digits. What do you get?
  37. 37.563? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 57 and take away the sum of its digits. What do you get?
  39. 39.Take 36 and take away the sum of its digits. What do you get?
  40. 40.396? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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