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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 316 · 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. 1.190? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 62 and take away the sum of its digits. What do you get?
  3. 3.623? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 45 and take away the sum of its digits. What do you get?
  5. 5.Take 82 and take away the sum of its digits. What do you get?
  6. 6.735? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.49?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?356 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 81 and take away the sum of its digits. What do you get?
  10. 10.69?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 36 and take away the sum of its digits. What do you get?
  12. 12.8?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.43?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 34 and take away the sum of its digits. What do you get?
  15. 15.48?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.1?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.1?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 94 and take away the sum of its digits. What do you get?
  19. 19.Take 21 and take away the sum of its digits. What do you get?
  20. 20.2?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 17 and take away the sum of its digits. What do you get?
  22. 22.1?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 71 and take away the sum of its digits. What do you get?
  24. 24.?949 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.10?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.2?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.252? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 48 and take away the sum of its digits. What do you get?
  30. 30.Take 19 and take away the sum of its digits. What do you get?
  31. 31.2?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?809 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.1?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?995 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.16? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.50?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 14 and take away the sum of its digits. What do you get?
  38. 38.?470 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 88 and take away the sum of its digits. What do you get?
  40. 40.Take 63 and take away the sum of its digits. What do you get?

Answer key

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

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