Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 179 · 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. 1.66? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 80 and take away the sum of its digits. What do you get?
3. 3.Take 68 and take away the sum of its digits. What do you get?
4. 4.?030 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.32?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.65?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 72 and take away the sum of its digits. What do you get?
8. 8.Take 25 and take away the sum of its digits. What do you get?
9. 9.50?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.?615 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 53 and take away the sum of its digits. What do you get?
12. 12.Take 23 and take away the sum of its digits. What do you get?
13. 13.Take 60 and take away the sum of its digits. What do you get?
14. 14.Take 20 and take away the sum of its digits. What do you get?
15. 15.6?52 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 85 and take away the sum of its digits. What do you get?
17. 17.807? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 32 and take away the sum of its digits. What do you get?
19. 19.785? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.3?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 71 and take away the sum of its digits. What do you get?
22. 22.260? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.5?38 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.131? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.Take 31 and take away the sum of its digits. What do you get?
26. 26.Take 34 and take away the sum of its digits. What do you get?
27. 27.335? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.2?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Take 26 and take away the sum of its digits. What do you get?
30. 30.28?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 19 and take away the sum of its digits. What do you get?
32. 32.?084 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 90 and take away the sum of its digits. What do you get?
34. 34.Take 99 and take away the sum of its digits. What do you get?
35. 35.Take 63 and take away the sum of its digits. What do you get?
36. 36.243? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 45 and take away the sum of its digits. What do you get?
38. 38.6?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.306? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 29 and take away the sum of its digits. What do you get?

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