Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 871 · 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.Take 47 and take away the sum of its digits. What do you get?
2. 2.Take 63 and take away the sum of its digits. What do you get?
3. 3.32?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 69 and take away the sum of its digits. What do you get?
5. 5.?263 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.505? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 31 and take away the sum of its digits. What do you get?
8. 8.?185 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.?005 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 35 and take away the sum of its digits. What do you get?
11. 11.Take 25 and take away the sum of its digits. What do you get?
12. 12.Take 83 and take away the sum of its digits. What do you get?
13. 13.Take 71 and take away the sum of its digits. What do you get?
14. 14.232? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.4?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 23 and take away the sum of its digits. What do you get?
17. 17.Take 33 and take away the sum of its digits. What do you get?
18. 18.2?37 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.193? 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. 21.41?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.857? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.?722 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 16 and take away the sum of its digits. What do you get?
25. 25.?920 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 82 and take away the sum of its digits. What do you get?
27. 27.Take 64 and take away the sum of its digits. What do you get?
28. 28.?570 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Take 96 and take away the sum of its digits. What do you get?
30. 30.484? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.7?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.11?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.?692 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.7?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 41 and take away the sum of its digits. What do you get?
36. 36.16? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.1?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 19 and take away the sum of its digits. What do you get?
39. 39.6?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 37 and take away the sum of its digits. What do you get?

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