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Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 668 · 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 63 and take away the sum of its digits. What do you get?
  2. 2.690? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.?808 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.?519 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.6?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.64?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.Take 95 and take away the sum of its digits. What do you get?
  8. 8.Take 35 and take away the sum of its digits. What do you get?
  9. 9.Take 69 and take away the sum of its digits. What do you get?
  10. 10.4?87 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Take 37 and take away the sum of its digits. What do you get?
  12. 12.Take 56 and take away the sum of its digits. What do you get?
  13. 13.50?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.?182 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Take 33 and take away the sum of its digits. What do you get?
  16. 16.Take 15 and take away the sum of its digits. What do you get?
  17. 17.1?95 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Take 31 and take away the sum of its digits. What do you get?
  19. 19.?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.622? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.3?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.270? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Take 74 and take away the sum of its digits. What do you get?
  24. 24.110? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.277? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.245? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 73 and take away the sum of its digits. What do you get?
  28. 28.?591 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.479? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.874? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.19?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.4?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Take 30 and take away the sum of its digits. What do you get?
  34. 34.?058 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.73?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Take 88 and take away the sum of its digits. What do you get?
  37. 37.?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.618? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.Take 97 and take away the sum of its digits. What do you get?
  40. 40.?830 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

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

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