← Digit-sum magic lesson New set →

Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 517 · 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.Take 44 and take away the sum of its digits. What do you get?
  2. 2.Take 36 and take away the sum of its digits. What do you get?
  3. 3.Take 46 and take away the sum of its digits. What do you get?
  4. 4.Take 80 and take away the sum of its digits. What do you get?
  5. 5.?682 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.24?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.2?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.?326 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 96 and take away the sum of its digits. What do you get?
  10. 10.?125 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.7?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.682? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.?419 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.49?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 91 and take away the sum of its digits. What do you get?
  16. 16.548? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.Take 92 and take away the sum of its digits. What do you get?
  18. 18.19?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 95 and take away the sum of its digits. What do you get?
  20. 20.Take 20 and take away the sum of its digits. What do you get?
  21. 21.Take 74 and take away the sum of its digits. What do you get?
  22. 22.Take 28 and take away the sum of its digits. What do you get?
  23. 23.?100 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.2?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Take 71 and take away the sum of its digits. What do you get?
  27. 27.50?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.?292 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.6?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?050 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.278? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?582 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.4?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.270? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.74?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.?857 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.3?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.813? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 85 and take away the sum of its digits. What do you get?
  40. 40.?319 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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