← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 620 · 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.?097 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.15?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.56?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.?329 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.1?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.15?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 98 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.Take 66 and take away the sum of its digits. What do you get?
  11. 11.414? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.?074 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 22 and take away the sum of its digits. What do you get?
  14. 14.Take 92 and take away the sum of its digits. What do you get?
  15. 15.?563 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.4?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 33 and take away the sum of its digits. What do you get?
  19. 19.?851 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 56 and take away the sum of its digits. What do you get?
  21. 21.36?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 79 and take away the sum of its digits. What do you get?
  23. 23.Take 82 and take away the sum of its digits. What do you get?
  24. 24.4?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.?439 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?678 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.705? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.7?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 95 and take away the sum of its digits. What do you get?
  30. 30.96? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?075 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?065 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?931 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?719 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.2?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.6?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 57 and take away the sum of its digits. What do you get?
  38. 38.Take 94 and take away the sum of its digits. What do you get?
  39. 39.30?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?929 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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