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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 43 · 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 75 and take away the sum of its digits. What do you get?
  2. 2.?362 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 37 and take away the sum of its digits. What do you get?
  4. 4.3?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 11 and take away the sum of its digits. What do you get?
  6. 6.Take 34 and take away the sum of its digits. What do you get?
  7. 7.57? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.7?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 47 and take away the sum of its digits. What do you get?
  10. 10.13?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.38?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.25?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 94 and take away the sum of its digits. What do you get?
  14. 14.3?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 50 and take away the sum of its digits. What do you get?
  16. 16.?326 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.70?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.8?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?254 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.6?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 25 and take away the sum of its digits. What do you get?
  23. 23.69?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 70 and take away the sum of its digits. What do you get?
  25. 25.88?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 16 and take away the sum of its digits. What do you get?
  27. 27.Take 24 and take away the sum of its digits. What do you get?
  28. 28.Take 64 and take away the sum of its digits. What do you get?
  29. 29.Take 21 and take away the sum of its digits. What do you get?
  30. 30.Take 53 and take away the sum of its digits. What do you get?
  31. 31.89?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 86 and take away the sum of its digits. What do you get?
  33. 33.196? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.620? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.3?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.5?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 65 and take away the sum of its digits. What do you get?
  39. 39.5?18 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 20 and take away the sum of its digits. What do you get?

Answer key

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

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