← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 267 · 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.?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 26 and take away the sum of its digits. What do you get?
  3. 3.Take 11 and take away the sum of its digits. What do you get?
  4. 4.?246 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.82?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.40?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.110? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.162? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.634? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 73 and take away the sum of its digits. What do you get?
  12. 12.3?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 13 and take away the sum of its digits. What do you get?
  14. 14.368? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 27 and take away the sum of its digits. What do you get?
  16. 16.?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 28 and take away the sum of its digits. What do you get?
  18. 18.?313 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.278? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.608? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.536? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.596? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.549? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.22?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 22 and take away the sum of its digits. What do you get?
  27. 27.?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Take 57 and take away the sum of its digits. What do you get?
  29. 29.Take 43 and take away the sum of its digits. What do you get?
  30. 30.53? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 88 and take away the sum of its digits. What do you get?
  32. 32.Take 49 and take away the sum of its digits. What do you get?
  33. 33.?714 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 46 and take away the sum of its digits. What do you get?
  36. 36.2?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.210? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.56?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 30 and take away the sum of its digits. What do you get?

Answer key

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

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