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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 482 · 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. 1.526? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 85 and take away the sum of its digits. What do you get?
  3. 3.?535 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Take 73 and take away the sum of its digits. What do you get?
  5. 5.10?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?844 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 24 and take away the sum of its digits. What do you get?
  8. 8.Take 64 and take away the sum of its digits. What do you get?
  9. 9.Take 44 and take away the sum of its digits. What do you get?
  10. 10.?202 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 40 and take away the sum of its digits. What do you get?
  13. 13.Take 21 and take away the sum of its digits. What do you get?
  14. 14.?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 97 and take away the sum of its digits. What do you get?
  16. 16.392? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 45 and take away the sum of its digits. What do you get?
  19. 19.Take 50 and take away the sum of its digits. What do you get?
  20. 20.5?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.265? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?847 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?293 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.38?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.423? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.47?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.7?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?807 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.71?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.14?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.3?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.30?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?449 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.48?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 65 and take away the sum of its digits. What do you get?
  37. 37.?384 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.554? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.2?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.57?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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