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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 618 · 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. 1.3?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?436 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.56?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.19? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?465 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?649 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.6?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?869 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?377 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 88 and take away the sum of its digits. What do you get?
  11. 11.64?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 84 and take away the sum of its digits. What do you get?
  13. 13.Take 74 and take away the sum of its digits. What do you get?
  14. 14.6?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 43 and take away the sum of its digits. What do you get?
  16. 16.Take 31 and take away the sum of its digits. What do you get?
  17. 17.?264 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.8?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.4?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.38?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 80 and take away the sum of its digits. What do you get?
  22. 22.Take 60 and take away the sum of its digits. What do you get?
  23. 23.674? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 17 and take away the sum of its digits. What do you get?
  25. 25.5?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 89 and take away the sum of its digits. What do you get?
  27. 27.419? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 69 and take away the sum of its digits. What do you get?
  29. 29.?491 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.512? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.5?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 29 and take away the sum of its digits. What do you get?
  33. 33.72? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 50 and take away the sum of its digits. What do you get?
  35. 35.69?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.773? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?759 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 85 and take away the sum of its digits. What do you get?
  39. 39.Take 34 and take away the sum of its digits. What do you get?
  40. 40.Take 44 and take away the sum of its digits. What do you get?

Answer key

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

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