Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 892 · 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. 1.668? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 38 and take away the sum of its digits. What do you get?
3. 3.85?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 33 and take away the sum of its digits. What do you get?
5. 5.Take 72 and take away the sum of its digits. What do you get?
6. 6.250? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 35 and take away the sum of its digits. What do you get?
8. 8.Take 19 and take away the sum of its digits. What do you get?
9. 9.373? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 89 and take away the sum of its digits. What do you get?
11. 11.?592 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 14 and take away the sum of its digits. What do you get?
13. 13.7?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.?460 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.81?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.?561 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.?170 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 21 and take away the sum of its digits. What do you get?
19. 19.55?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.Take 61 and take away the sum of its digits. What do you get?
21. 21.Take 47 and take away the sum of its digits. What do you get?
22. 22.6?73 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 68 and take away the sum of its digits. What do you get?
24. 24.Take 52 and take away the sum of its digits. What do you get?
25. 25.48? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.?923 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.1?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.56?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.10?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.3?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.6?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 44 and take away the sum of its digits. What do you get?
33. 33.?094 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.?858 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.136? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 36 and take away the sum of its digits. What do you get?
37. 37.108? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 95 and take away the sum of its digits. What do you get?
39. 39.Take 11 and take away the sum of its digits. What do you get?
40. 40.Take 69 and take away the sum of its digits. What do you get?

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