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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 33 · 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 60 and take away the sum of its digits. What do you get?
  2. 2.1?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.4?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?361 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 34 and take away the sum of its digits. What do you get?
  6. 6.47?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 96 and take away the sum of its digits. What do you get?
  8. 8.?002 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.6?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.22?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 62 and take away the sum of its digits. What do you get?
  13. 13.897? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 53 and take away the sum of its digits. What do you get?
  15. 15.65?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.331? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 24 and take away the sum of its digits. What do you get?
  18. 18.Take 86 and take away the sum of its digits. What do you get?
  19. 19.2?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 19 and take away the sum of its digits. What do you get?
  21. 21.?556 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?505 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?253 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?520 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 42 and take away the sum of its digits. What do you get?
  26. 26.Take 11 and take away the sum of its digits. What do you get?
  27. 27.Take 76 and take away the sum of its digits. What do you get?
  28. 28.81?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 55 and take away the sum of its digits. What do you get?
  30. 30.?317 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.4?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.12?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 94 and take away the sum of its digits. What do you get?
  35. 35.6?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 48 and take away the sum of its digits. What do you get?
  37. 37.Take 66 and take away the sum of its digits. What do you get?
  38. 38.?165 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 23 and take away the sum of its digits. What do you get?
  40. 40.21?6 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. 4
  3. 9
  4. 8
  5. 27
  6. 5
  7. 81
  8. 7
  9. 3
  10. 8
  11. 8
  12. 54
  13. 3
  14. 45
  15. 1
  16. 2
  17. 18
  18. 72
  19. 5
  20. 9
  21. 2
  22. 8
  23. 8
  24. 2
  25. 36
  26. 9
  27. 63
  28. 9
  29. 45
  30. 7
  31. 2
  32. 8
  33. 6
  34. 81
  35. 4
  36. 36
  37. 54
  38. 6
  39. 18
  40. 9

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