Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 571 · 40 questions

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.)

1. 1.38?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.?559 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.630? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 32 and take away the sum of its digits. What do you get?
5. 5.10?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.?574 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 38 and take away the sum of its digits. What do you get?
8. 8.?02 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. 10.5?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.8?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 59 and take away the sum of its digits. What do you get?
13. 13.Take 18 and take away the sum of its digits. What do you get?
14. 14.Take 97 and take away the sum of its digits. What do you get?
15. 15.4?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 78 and take away the sum of its digits. What do you get?
17. 17.4?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 69 and take away the sum of its digits. What do you get?
19. 19.Take 66 and take away the sum of its digits. What do you get?
20. 20.5?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 74 and take away the sum of its digits. What do you get?
22. 22.Take 31 and take away the sum of its digits. What do you get?
23. 23.Take 33 and take away the sum of its digits. What do you get?
24. 24.?789 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.9?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.706? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.7?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.40?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Take 73 and take away the sum of its digits. What do you get?
30. 30.23?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.1?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 24 and take away the sum of its digits. What do you get?
33. 33.?085 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 89 and take away the sum of its digits. What do you get?
35. 35.87?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 36 and take away the sum of its digits. What do you get?
37. 37.806? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 49 and take away the sum of its digits. What do you get?
39. 39.Take 85 and take away the sum of its digits. What do you get?
40. 40.Take 91 and take away the sum of its digits. What do you get?

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