Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 577 · 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. 1.67?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 66 and take away the sum of its digits. What do you get?
3. 3.4?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.4?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 33 and take away the sum of its digits. What do you get?
6. 6.Take 56 and take away the sum of its digits. What do you get?
7. 7.328? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.74?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.223? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 41 and take away the sum of its digits. What do you get?
11. 11.?942 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 58 and take away the sum of its digits. What do you get?
13. 13.?717 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.45?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 21 and take away the sum of its digits. What do you get?
16. 16.798? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 89 and take away the sum of its digits. What do you get?
18. 18.2?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.6?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.88?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.?326 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 23 and take away the sum of its digits. What do you get?
23. 23.1?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 46 and take away the sum of its digits. What do you get?
25. 25.11?2 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 40 and take away the sum of its digits. What do you get?
28. 28.Take 98 and take away the sum of its digits. What do you get?
29. 29.1?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 16 and take away the sum of its digits. What do you get?
31. 31.Take 26 and take away the sum of its digits. What do you get?
32. 32.Take 30 and take away the sum of its digits. What do you get?
33. 33.80?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.114? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 78 and take away the sum of its digits. What do you get?
36. 36.?854 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 34 and take away the sum of its digits. What do you get?
38. 38.?691 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 55 and take away the sum of its digits. What do you get?
40. 40.8?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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