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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 351 · 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 40 and take away the sum of its digits. What do you get?
  2. 2.?655 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.41?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.46?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.856? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?140 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.743? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 15 and take away the sum of its digits. What do you get?
  9. 9.Take 97 and take away the sum of its digits. What do you get?
  10. 10.7?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?656 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 11 and take away the sum of its digits. What do you get?
  13. 13.Take 26 and take away the sum of its digits. What do you get?
  14. 14.?125 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 79 and take away the sum of its digits. What do you get?
  16. 16.524? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 61 and take away the sum of its digits. What do you get?
  18. 18.55?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.267? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 22 and take away the sum of its digits. What do you get?
  21. 21.?354 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.97? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 29 and take away the sum of its digits. What do you get?
  24. 24.Take 70 and take away the sum of its digits. What do you get?
  25. 25.660? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?377 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 59 and take away the sum of its digits. What do you get?
  28. 28.86?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 24 and take away the sum of its digits. What do you get?
  30. 30.Take 78 and take away the sum of its digits. What do you get?
  31. 31.112? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 30 and take away the sum of its digits. What do you get?
  33. 33.Take 74 and take away the sum of its digits. What do you get?
  34. 34.?366 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 37 and take away the sum of its digits. What do you get?
  36. 36.844? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.369? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?491 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.5?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.5?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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