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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 41 · 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 33 and take away the sum of its digits. What do you get?
  2. 2.Take 27 and take away the sum of its digits. What do you get?
  3. 3.6?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?404 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 35 and take away the sum of its digits. What do you get?
  6. 6.Take 65 and take away the sum of its digits. What do you get?
  7. 7.?429 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?736 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 97 and take away the sum of its digits. What do you get?
  10. 10.3?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?469 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 38 and take away the sum of its digits. What do you get?
  13. 13.5?87 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.221? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 16 and take away the sum of its digits. What do you get?
  16. 16.?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?627 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?595 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.40?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.?168 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.79?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 80 and take away the sum of its digits. What do you get?
  23. 23.?478 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?286 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.6?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?296 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.42? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.7?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.61?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 92 and take away the sum of its digits. What do you get?
  32. 32.79? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.4?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?412 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?220 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?875 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?211 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.54?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.22?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 88 and take away the sum of its digits. What do you get?

Answer key

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

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