← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 543 · 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. 1.7?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.Take 24 and take away the sum of its digits. What do you get?
  3. 3.Take 53 and take away the sum of its digits. What do you get?
  4. 4.1?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Take 86 and take away the sum of its digits. What do you get?
  6. 6.55?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.4?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?49 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.7?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.43?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 35 and take away the sum of its digits. What do you get?
  12. 12.?331 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?762 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Take 82 and take away the sum of its digits. What do you get?
  15. 15.241? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.?399 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.82?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.6?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.4?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 94 and take away the sum of its digits. What do you get?
  21. 21.88?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.131? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.43?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.40?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.2?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.2?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 38 and take away the sum of its digits. What do you get?
  28. 28.Take 54 and take away the sum of its digits. What do you get?
  29. 29.247? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?787 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.8?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.26?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.?039 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.?256 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.?627 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.19? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 89 and take away the sum of its digits. What do you get?
  38. 38.Take 88 and take away the sum of its digits. What do you get?
  39. 39.?641 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.?106 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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