← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 926 · 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. 1.708? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 34 and take away the sum of its digits. What do you get?
  3. 3.Take 36 and take away the sum of its digits. What do you get?
  4. 4.162? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?466 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.?080 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.?152 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.5?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.94? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 94 and take away the sum of its digits. What do you get?
  11. 11.?125 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?343 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.539? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?647 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 23 and take away the sum of its digits. What do you get?
  16. 16.?024 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?366 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.?026 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 99 and take away the sum of its digits. What do you get?
  21. 21.6?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.?850 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.7?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.73?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.504? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 76 and take away the sum of its digits. What do you get?
  27. 27.Take 25 and take away the sum of its digits. What do you get?
  28. 28.?599 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.19?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.241? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 44 and take away the sum of its digits. What do you get?
  32. 32.842? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.6?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.44? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.490? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.12?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 92 and take away the sum of its digits. What do you get?
  38. 38.3?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.734? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 74 and take away the sum of its digits. What do you get?

Answer key

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

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks