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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 681 · 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 68 and take away the sum of its digits. What do you get?
  2. 2.Take 20 and take away the sum of its digits. What do you get?
  3. 3.1?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.48?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.2?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.51?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 46 and take away the sum of its digits. What do you get?
  8. 8.Take 61 and take away the sum of its digits. What do you get?
  9. 9.Take 37 and take away the sum of its digits. What do you get?
  10. 10.1?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.17?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.36?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.503? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?758 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.76?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.210? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 41 and take away the sum of its digits. What do you get?
  18. 18.43?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?813 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.76? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.190? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.34?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.77?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.262? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?928 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.41? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.8?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.68?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 87 and take away the sum of its digits. What do you get?
  30. 30.Take 29 and take away the sum of its digits. What do you get?
  31. 31.Take 59 and take away the sum of its digits. What do you get?
  32. 32.10?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.429? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?438 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 62 and take away the sum of its digits. What do you get?
  36. 36.193? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.33?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 51 and take away the sum of its digits. What do you get?
  39. 39.Take 26 and take away the sum of its digits. What do you get?
  40. 40.Take 30 and take away the sum of its digits. What do you get?

Answer key

  1. 54
  2. 18
  3. 6
  4. 8
  5. 4
  6. 5
  7. 36
  8. 54
  9. 27
  10. 2
  11. 4
  12. 8
  13. 1
  14. 7
  15. 3
  16. 6
  17. 36
  18. 7
  19. 6
  20. 5
  21. 8
  22. 2
  23. 1
  24. 8
  25. 8
  26. 4
  27. 2
  28. 7
  29. 72
  30. 18
  31. 45
  32. 3
  33. 3
  34. 3
  35. 54
  36. 5
  37. 5
  38. 45
  39. 18
  40. 27

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