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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 139 · 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 84 and take away the sum of its digits. What do you get?
  2. 2.6?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?042 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?043 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.880? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 82 and take away the sum of its digits. What do you get?
  8. 8.Take 56 and take away the sum of its digits. What do you get?
  9. 9.Take 44 and take away the sum of its digits. What do you get?
  10. 10.?208 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.453? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.6?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.?163 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.438? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 49 and take away the sum of its digits. What do you get?
  18. 18.47?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 29 and take away the sum of its digits. What do you get?
  20. 20.Take 33 and take away the sum of its digits. What do you get?
  21. 21.8?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.598? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 51 and take away the sum of its digits. What do you get?
  24. 24.?933 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 79 and take away the sum of its digits. What do you get?
  26. 26.?353 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.405? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.5?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 15 and take away the sum of its digits. What do you get?
  30. 30.35?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?782 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.32? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.60? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.201? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.2?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.778? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 81 and take away the sum of its digits. What do you get?
  38. 38.8?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?106 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 25 and take away the sum of its digits. What do you get?

Answer key

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

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