Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 726 · 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.?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.?978 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.?160 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.?385 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.1?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 64 and take away the sum of its digits. What do you get?
8. 8.4?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Take 47 and take away the sum of its digits. What do you get?
10. 10.Take 33 and take away the sum of its digits. What do you get?
11. 11.?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 26 and take away the sum of its digits. What do you get?
14. 14.46?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 48 and take away the sum of its digits. What do you get?
16. 16.866? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 88 and take away the sum of its digits. What do you get?
18. 18.Take 84 and take away the sum of its digits. What do you get?
19. 19.4?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.Take 32 and take away the sum of its digits. What do you get?
21. 21.460? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.?309 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.?139 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.50?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.Take 65 and take away the sum of its digits. What do you get?
26. 26.Take 19 and take away the sum of its digits. What do you get?
27. 27.Take 96 and take away the sum of its digits. What do you get?
28. 28.391? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.230? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.870? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 74 and take away the sum of its digits. What do you get?
32. 32.792? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 95 and take away the sum of its digits. What do you get?
34. 34.Take 29 and take away the sum of its digits. What do you get?
35. 35.Take 60 and take away the sum of its digits. What do you get?
36. 36.8?67 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 87 and take away the sum of its digits. What do you get?
38. 38.Take 40 and take away the sum of its digits. What do you get?
39. 39.Take 35 and take away the sum of its digits. What do you get?
40. 40.Take 71 and take away the sum of its digits. What do you get?

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