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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 19 · 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 38 and take away the sum of its digits. What do you get?
  2. 2.850? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.8?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.2?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.2?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 60 and take away the sum of its digits. What do you get?
  7. 7.3?38 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?905 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 95 and take away the sum of its digits. What do you get?
  10. 10.?421 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 34 and take away the sum of its digits. What do you get?
  12. 12.38?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.7?82 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?583 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.117? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?572 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.268? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.38?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.26?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.1?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?960 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 44 and take away the sum of its digits. What do you get?
  24. 24.?415 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.875? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.65?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 42 and take away the sum of its digits. What do you get?
  28. 28.2?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.172? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?570 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?863 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 26 and take away the sum of its digits. What do you get?
  34. 34.?930 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.22?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 31 and take away the sum of its digits. What do you get?
  37. 37.51?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 65 and take away the sum of its digits. What do you get?
  39. 39.Take 64 and take away the sum of its digits. What do you get?
  40. 40.Take 52 and take away the sum of its digits. What do you get?

Answer key

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

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