← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 499 · 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?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 64 and take away the sum of its digits. What do you get?
  3. 3.Take 23 and take away the sum of its digits. What do you get?
  4. 4.?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 33 and take away the sum of its digits. What do you get?
  6. 6.?373 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.26?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.129? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 46 and take away the sum of its digits. What do you get?
  10. 10.?703 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 11 and take away the sum of its digits. What do you get?
  12. 12.19?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 18 and take away the sum of its digits. What do you get?
  14. 14.Take 78 and take away the sum of its digits. What do you get?
  15. 15.Take 20 and take away the sum of its digits. What do you get?
  16. 16.Take 89 and take away the sum of its digits. What do you get?
  17. 17.Take 71 and take away the sum of its digits. What do you get?
  18. 18.Take 58 and take away the sum of its digits. What do you get?
  19. 19.7?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.12?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.1?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Take 52 and take away the sum of its digits. What do you get?
  23. 23.791? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?512 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.429? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.?650 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.50?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?028 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Take 96 and take away the sum of its digits. What do you get?
  30. 30.5?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.?046 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?479 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?473 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.4?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.89?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?582 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.?254 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1?82 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.Take 17 and take away the sum of its digits. What do you get?

Answer key

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

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