Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 475 · 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. 1.1?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.14?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 49 and take away the sum of its digits. What do you get?
4. 4.Take 13 and take away the sum of its digits. What do you get?
5. 5.?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.43? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 42 and take away the sum of its digits. What do you get?
8. 8.Take 82 and take away the sum of its digits. What do you get?
9. 9.?899 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.628? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.?463 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.6?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 78 and take away the sum of its digits. What do you get?
14. 14.6?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 28 and take away the sum of its digits. What do you get?
16. 16.?742 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 91 and take away the sum of its digits. What do you get?
18. 18.?879 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.236? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.Take 81 and take away the sum of its digits. What do you get?
21. 21.Take 38 and take away the sum of its digits. What do you get?
22. 22.75?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 60 and take away the sum of its digits. What do you get?
24. 24.Take 48 and take away the sum of its digits. What do you get?
25. 25.7?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 23 and take away the sum of its digits. What do you get?
27. 27.2?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 32 and take away the sum of its digits. What do you get?
29. 29.24?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 54 and take away the sum of its digits. What do you get?
31. 31.Take 16 and take away the sum of its digits. What do you get?
32. 32.6?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.?331 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.284? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.79?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 41 and take away the sum of its digits. What do you get?
37. 37.?071 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.?269 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 44 and take away the sum of its digits. What do you get?
40. 40.510? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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