Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 246 · 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. 1.23?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 87 and take away the sum of its digits. What do you get?
3. 3.Take 80 and take away the sum of its digits. What do you get?
4. 4.83? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 88 and take away the sum of its digits. What do you get?
6. 6.636? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.82?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 59 and take away the sum of its digits. What do you get?
9. 9.6?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 79 and take away the sum of its digits. What do you get?
11. 11.?939 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 85 and take away the sum of its digits. What do you get?
13. 13.3?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.61?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 89 and take away the sum of its digits. What do you get?
16. 16.30?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.77?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.?571 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.8?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.Take 25 and take away the sum of its digits. What do you get?
21. 21.3?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 13 and take away the sum of its digits. What do you get?
25. 25.?520 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 24 and take away the sum of its digits. What do you get?
27. 27.Take 32 and take away the sum of its digits. What do you get?
28. 28.Take 99 and take away the sum of its digits. What do you get?
29. 29.536? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.342? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 69 and take away the sum of its digits. What do you get?
32. 32.Take 11 and take away the sum of its digits. What do you get?
33. 33.Take 57 and take away the sum of its digits. What do you get?
34. 34.1?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.?546 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.26?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 15 and take away the sum of its digits. What do you get?
39. 39.Take 66 and take away the sum of its digits. What do you get?
40. 40.Take 81 and take away the sum of its digits. What do you get?

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