Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 470 · 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.?713 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.605? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.4?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.123? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.?493 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Take 62 and take away the sum of its digits. What do you get?
7. 7.?899 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 82 and take away the sum of its digits. What do you get?
9. 9.Take 31 and take away the sum of its digits. What do you get?
10. 10.1?03 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.?71 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 45 and take away the sum of its digits. What do you get?
13. 13.Take 33 and take away the sum of its digits. What do you get?
14. 14.74? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.24?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.1?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.2?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.11?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 55 and take away the sum of its digits. What do you get?
20. 20.Take 28 and take away the sum of its digits. What do you get?
21. 21.?678 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 50 and take away the sum of its digits. What do you get?
23. 23.4?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 53 and take away the sum of its digits. What do you get?
25. 25.?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 66 and take away the sum of its digits. What do you get?
27. 27.Take 23 and take away the sum of its digits. What do you get?
28. 28.?550 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.?840 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.531? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 90 and take away the sum of its digits. What do you get?
32. 32.Take 74 and take away the sum of its digits. What do you get?
33. 33.44?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 98 and take away the sum of its digits. What do you get?
35. 35.21?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 86 and take away the sum of its digits. What do you get?
37. 37.Take 56 and take away the sum of its digits. What do you get?
38. 38.Take 67 and take away the sum of its digits. What do you get?
39. 39.Take 48 and take away the sum of its digits. What do you get?
40. 40.Take 27 and take away the sum of its digits. What do you get?

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