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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 306 · 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. 1.1?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 76 and take away the sum of its digits. What do you get?
  3. 3.37?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.5?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 14 and take away the sum of its digits. What do you get?
  6. 6.?352 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?125 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.37?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 30 and take away the sum of its digits. What do you get?
  10. 10.39? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?668 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.63?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 18 and take away the sum of its digits. What do you get?
  14. 14.701? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 32 and take away the sum of its digits. What do you get?
  16. 16.Take 80 and take away the sum of its digits. What do you get?
  17. 17.?424 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.56?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.1?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?769 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?871 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?164 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?406 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 23 and take away the sum of its digits. What do you get?
  25. 25.48?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 50 and take away the sum of its digits. What do you get?
  27. 27.7?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.265? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?278 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?926 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.8?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.26?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.27?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.598? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?195 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?977 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?395 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 19 and take away the sum of its digits. What do you get?
  39. 39.Take 39 and take away the sum of its digits. What do you get?
  40. 40.Take 26 and take away the sum of its digits. What do you get?

Answer key

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

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