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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 627 · 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 63 and take away the sum of its digits. What do you get?
  2. 2.Take 37 and take away the sum of its digits. What do you get?
  3. 3.Take 62 and take away the sum of its digits. What do you get?
  4. 4.Take 88 and take away the sum of its digits. What do you get?
  5. 5.?395 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.681? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 58 and take away the sum of its digits. What do you get?
  8. 8.5?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?067 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 98 and take away the sum of its digits. What do you get?
  11. 11.45?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?202 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.7?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.6?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 75 and take away the sum of its digits. What do you get?
  18. 18.526? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.605? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 40 and take away the sum of its digits. What do you get?
  21. 21.22?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.95? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 56 and take away the sum of its digits. What do you get?
  24. 24.86?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?289 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.6?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.?860 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.1?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?839 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.35?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?903 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?038 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 22 and take away the sum of its digits. What do you get?
  34. 34.Take 24 and take away the sum of its digits. What do you get?
  35. 35.?826 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.14?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 80 and take away the sum of its digits. What do you get?
  38. 38.Take 38 and take away the sum of its digits. What do you get?
  39. 39.Take 55 and take away the sum of its digits. What do you get?
  40. 40.54?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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