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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 883 · 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. 1.5?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 46 and take away the sum of its digits. What do you get?
  3. 3.Take 39 and take away the sum of its digits. What do you get?
  4. 4.9?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.566? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.1?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 26 and take away the sum of its digits. What do you get?
  8. 8.60?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.790? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.8?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 99 and take away the sum of its digits. What do you get?
  12. 12.397? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?641 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?154 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?024 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.19?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.1?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?460 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.476? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?429 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.6?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 40 and take away the sum of its digits. What do you get?
  23. 23.Take 43 and take away the sum of its digits. What do you get?
  24. 24.220? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.56?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.88?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 50 and take away the sum of its digits. What do you get?
  28. 28.3?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?300 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.1?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.42?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?791 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.7?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?431 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.71?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?419 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 57 and take away the sum of its digits. What do you get?
  38. 38.20?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 11 and take away the sum of its digits. What do you get?
  40. 40.Take 51 and take away the sum of its digits. What do you get?

Answer key

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

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