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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 399 · 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 54 and take away the sum of its digits. What do you get?
  2. 2.Take 45 and take away the sum of its digits. What do you get?
  3. 3.?735 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 99 and take away the sum of its digits. What do you get?
  5. 5.Take 77 and take away the sum of its digits. What do you get?
  6. 6.Take 23 and take away the sum of its digits. What do you get?
  7. 7.?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?430 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?043 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?059 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 37 and take away the sum of its digits. What do you get?
  12. 12.Take 65 and take away the sum of its digits. What do you get?
  13. 13.6?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.91? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 12 and take away the sum of its digits. What do you get?
  16. 16.?886 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.34? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 38 and take away the sum of its digits. What do you get?
  19. 19.?551 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.3?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.2?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.831? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 41 and take away the sum of its digits. What do you get?
  24. 24.Take 73 and take away the sum of its digits. What do you get?
  25. 25.?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.1?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.7?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.605? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.508? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 53 and take away the sum of its digits. What do you get?
  31. 31.64? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.18?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 35 and take away the sum of its digits. What do you get?
  35. 35.Take 16 and take away the sum of its digits. What do you get?
  36. 36.?296 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 33 and take away the sum of its digits. What do you get?
  38. 38.Take 98 and take away the sum of its digits. What do you get?
  39. 39.5?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 18 and take away the sum of its digits. What do you get?

Answer key

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

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