Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 161 · 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.?660 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.1?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 84 and take away the sum of its digits. What do you get?
4. 4.Take 41 and take away the sum of its digits. What do you get?
5. 5.?082 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.397? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.1?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.65?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.3?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 71 and take away the sum of its digits. What do you get?
11. 11.?56 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 48 and take away the sum of its digits. What do you get?
13. 13.1?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.360? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.49?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 80 and take away the sum of its digits. What do you get?
17. 17.Take 60 and take away the sum of its digits. What do you get?
18. 18.71?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.26? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.69?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.?210 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.78? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.?312 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 68 and take away the sum of its digits. What do you get?
25. 25.519? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 27 and take away the sum of its digits. What do you get?
27. 27.Take 21 and take away the sum of its digits. What do you get?
28. 28.Take 76 and take away the sum of its digits. What do you get?
29. 29.?469 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 36 and take away the sum of its digits. What do you get?
31. 31.488? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 78 and take away the sum of its digits. What do you get?
33. 33.?274 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 74 and take away the sum of its digits. What do you get?
35. 35.Take 64 and take away the sum of its digits. What do you get?
36. 36.Take 91 and take away the sum of its digits. What do you get?
37. 37.Take 79 and take away the sum of its digits. What do you get?
38. 38.Take 81 and take away the sum of its digits. What do you get?
39. 39.Take 14 and take away the sum of its digits. What do you get?
40. 40.Take 47 and take away the sum of its digits. What do you get?

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