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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 995 · 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.?741 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.?627 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 28 and take away the sum of its digits. What do you get?
  4. 4.Take 20 and take away the sum of its digits. What do you get?
  5. 5.Take 11 and take away the sum of its digits. What do you get?
  6. 6.8?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 24 and take away the sum of its digits. What do you get?
  8. 8.198? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.479? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.57?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 94 and take away the sum of its digits. What do you get?
  12. 12.84? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?572 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.80? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.8?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.2?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.5?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?582 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.5?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.5?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.308? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.23?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?203 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.30?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?668 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 41 and take away the sum of its digits. What do you get?
  30. 30.6?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.3?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?847 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 72 and take away the sum of its digits. What do you get?
  34. 34.?339 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 89 and take away the sum of its digits. What do you get?
  36. 36.2?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 62 and take away the sum of its digits. What do you get?
  38. 38.Take 92 and take away the sum of its digits. What do you get?
  39. 39.708? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.67?0 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. 3
  3. 18
  4. 18
  5. 9
  6. 2
  7. 18
  8. 9
  9. 7
  10. 5
  11. 81
  12. 6
  13. 4
  14. 9
  15. 1
  16. 2
  17. 1
  18. 6
  19. 3
  20. 1
  21. 5
  22. 7
  23. 7
  24. 9
  25. 4
  26. 8
  27. 6
  28. 7
  29. 36
  30. 2
  31. 9
  32. 8
  33. 63
  34. 3
  35. 72
  36. 4
  37. 54
  38. 81
  39. 3
  40. 5

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