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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 965 · 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. 1.525? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.342? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 59 and take away the sum of its digits. What do you get?
  4. 4.29?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?226 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.1?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 46 and take away the sum of its digits. What do you get?
  8. 8.Take 19 and take away the sum of its digits. What do you get?
  9. 9.69?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 55 and take away the sum of its digits. What do you get?
  11. 11.3?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.78?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.410? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.682? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.35?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.159? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.8?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 78 and take away the sum of its digits. What do you get?
  19. 19.5?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 52 and take away the sum of its digits. What do you get?
  21. 21.40?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 61 and take away the sum of its digits. What do you get?
  24. 24.Take 17 and take away the sum of its digits. What do you get?
  25. 25.65?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 67 and take away the sum of its digits. What do you get?
  27. 27.262? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?070 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?546 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.442? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.1?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Take 97 and take away the sum of its digits. What do you get?
  33. 33.Take 13 and take away the sum of its digits. What do you get?
  34. 34.70?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 84 and take away the sum of its digits. What do you get?
  36. 36.5?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?492 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Take 51 and take away the sum of its digits. What do you get?
  39. 39.2?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.1?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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