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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 294 · 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. 1.81?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 52 and take away the sum of its digits. What do you get?
  3. 3.Take 29 and take away the sum of its digits. What do you get?
  4. 4.?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 44 and take away the sum of its digits. What do you get?
  6. 6.?304 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.257? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.55?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.35?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.33?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 54 and take away the sum of its digits. What do you get?
  12. 12.Take 73 and take away the sum of its digits. What do you get?
  13. 13.4?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.6?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.230? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.195? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 50 and take away the sum of its digits. What do you get?
  18. 18.32?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 60 and take away the sum of its digits. What do you get?
  20. 20.Take 59 and take away the sum of its digits. What do you get?
  21. 21.23? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 14 and take away the sum of its digits. What do you get?
  23. 23.?088 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 71 and take away the sum of its digits. What do you get?
  25. 25.?607 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 74 and take away the sum of its digits. What do you get?
  27. 27.Take 12 and take away the sum of its digits. What do you get?
  28. 28.208? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?418 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 92 and take away the sum of its digits. What do you get?
  31. 31.?785 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.7?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.217? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 30 and take away the sum of its digits. What do you get?
  36. 36.Take 80 and take away the sum of its digits. What do you get?
  37. 37.71? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.51? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.59?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 24 and take away the sum of its digits. What do you get?

Answer key

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

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