Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 802 · 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. 1.876? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 24 and take away the sum of its digits. What do you get?
3. 3.Take 45 and take away the sum of its digits. What do you get?
4. 4.576? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 63 and take away the sum of its digits. What do you get?
6. 6.807? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 11 and take away the sum of its digits. What do you get?
8. 8.?274 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Take 54 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. 11.653? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.56?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 73 and take away the sum of its digits. What do you get?
14. 14.Take 26 and take away the sum of its digits. What do you get?
15. 15.Take 94 and take away the sum of its digits. What do you get?
16. 16.Take 12 and take away the sum of its digits. What do you get?
17. 17.?681 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 91 and take away the sum of its digits. What do you get?
19. 19.Take 23 and take away the sum of its digits. What do you get?
20. 20.2?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 36 and take away the sum of its digits. What do you get?
22. 22.?269 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.5?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.6?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.?939 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 56 and take away the sum of its digits. What do you get?
27. 27.25?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.7?33 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Take 75 and take away the sum of its digits. What do you get?
30. 30.818? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 77 and take away the sum of its digits. What do you get?
32. 32.?314 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.102? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.1?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 84 and take away the sum of its digits. What do you get?
36. 36.Take 85 and take away the sum of its digits. What do you get?
37. 37.508? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.514? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.303? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.?338 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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