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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 296 · 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 44 and take away the sum of its digits. What do you get?
  2. 2.2?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 24 and take away the sum of its digits. What do you get?
  4. 4.233? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?395 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.10?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?156 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.345? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?607 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 49 and take away the sum of its digits. What do you get?
  11. 11.?103 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?078 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?550 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?386 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 51 and take away the sum of its digits. What do you get?
  16. 16.?341 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.10? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.32? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 20 and take away the sum of its digits. What do you get?
  21. 21.?730 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.603? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.?389 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Take 25 and take away the sum of its digits. What do you get?
  25. 25.Take 30 and take away the sum of its digits. What do you get?
  26. 26.?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.24?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.22?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.?382 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.8?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 92 and take away the sum of its digits. What do you get?
  32. 32.7?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?701 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Take 53 and take away the sum of its digits. What do you get?
  35. 35.Take 95 and take away the sum of its digits. What do you get?
  36. 36.202? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.5?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.69?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?18 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 50 and take away the sum of its digits. What do you get?

Answer key

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

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