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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 563 · 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 61 and take away the sum of its digits. What do you get?
  2. 2.Take 31 and take away the sum of its digits. What do you get?
  3. 3.9?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 96 and take away the sum of its digits. What do you get?
  5. 5.Take 82 and take away the sum of its digits. What do you get?
  6. 6.5?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.78?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?259 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?071 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 78 and take away the sum of its digits. What do you get?
  11. 11.Take 32 and take away the sum of its digits. What do you get?
  12. 12.6?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.3?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 66 and take away the sum of its digits. What do you get?
  15. 15.835? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.Take 35 and take away the sum of its digits. What do you get?
  17. 17.?443 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 36 and take away the sum of its digits. What do you get?
  19. 19.Take 52 and take away the sum of its digits. What do you get?
  20. 20.3?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 27 and take away the sum of its digits. What do you get?
  22. 22.Take 64 and take away the sum of its digits. What do you get?
  23. 23.10?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.19?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.168? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?202 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.44?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 83 and take away the sum of its digits. What do you get?
  29. 29.Take 92 and take away the sum of its digits. What do you get?
  30. 30.?037 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.761? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?672 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 68 and take away the sum of its digits. What do you get?
  34. 34.76?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 77 and take away the sum of its digits. What do you get?
  36. 36.84?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.50?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 50 and take away the sum of its digits. What do you get?
  39. 39.890? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 34 and take away the sum of its digits. What do you get?

Answer key

  1. 54
  2. 27
  3. 8
  4. 81
  5. 72
  6. 8
  7. 2
  8. 2
  9. 1
  10. 63
  11. 27
  12. 4
  13. 5
  14. 54
  15. 2
  16. 27
  17. 7
  18. 27
  19. 45
  20. 1
  21. 18
  22. 54
  23. 9
  24. 4
  25. 3
  26. 5
  27. 7
  28. 72
  29. 81
  30. 8
  31. 4
  32. 3
  33. 54
  34. 3
  35. 63
  36. 6
  37. 7
  38. 45
  39. 1
  40. 27

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