← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 909 · 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.?046 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.79?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?475 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.83?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.83?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Take 44 and take away the sum of its digits. What do you get?
  7. 7.Take 54 and take away the sum of its digits. What do you get?
  8. 8.711? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.3?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.7?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.?253 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Take 60 and take away the sum of its digits. What do you get?
  13. 13.Take 11 and take away the sum of its digits. What do you get?
  14. 14.30?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.6?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.131? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 37 and take away the sum of its digits. What do you get?
  18. 18.?554 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.76?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 89 and take away the sum of its digits. What do you get?
  21. 21.47?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.535? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.12?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.705? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Take 79 and take away the sum of its digits. What do you get?
  26. 26.73?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 36 and take away the sum of its digits. What do you get?
  28. 28.35?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.38?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?681 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.72?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.204? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 49 and take away the sum of its digits. What do you get?
  34. 34.?60 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 22 and take away the sum of its digits. What do you get?
  36. 36.?500 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?310 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?893 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.3?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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