← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 596 · 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. 1.9?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.1?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.Take 47 and take away the sum of its digits. What do you get?
  4. 4.Take 99 and take away the sum of its digits. What do you get?
  5. 5.Take 95 and take away the sum of its digits. What do you get?
  6. 6.Take 83 and take away the sum of its digits. What do you get?
  7. 7.426? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 49 and take away the sum of its digits. What do you get?
  9. 9.1?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.17?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 22 and take away the sum of its digits. What do you get?
  12. 12.2?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.740? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?814 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.6?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.3?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 27 and take away the sum of its digits. What do you get?
  18. 18.Take 36 and take away the sum of its digits. What do you get?
  19. 19.Take 67 and take away the sum of its digits. What do you get?
  20. 20.14?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.7?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 64 and take away the sum of its digits. What do you get?
  24. 24.Take 30 and take away the sum of its digits. What do you get?
  25. 25.9?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.533? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.689? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?719 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.2?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?500 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?922 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?079 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.39? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.53?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 19 and take away the sum of its digits. What do you get?
  36. 36.34?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.47?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.8?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.42? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?193 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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