Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 856 · 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.?924 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 25 and take away the sum of its digits. What do you get?
3. 3.13? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 63 and take away the sum of its digits. What do you get?
5. 5.Take 29 and take away the sum of its digits. What do you get?
6. 6.?570 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.?577 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.?084 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.63?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.1?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.7?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 20 and take away the sum of its digits. What do you get?
13. 13.?548 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.?967 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.3?23 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.305? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.?191 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 92 and take away the sum of its digits. What do you get?
19. 19.?012 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.18?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.52?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 96 and take away the sum of its digits. What do you get?
23. 23.Take 99 and take away the sum of its digits. What do you get?
24. 24.Take 31 and take away the sum of its digits. What do you get?
25. 25.?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 83 and take away the sum of its digits. What do you get?
27. 27.454? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 35 and take away the sum of its digits. What do you get?
29. 29.Take 66 and take away the sum of its digits. What do you get?
30. 30.Take 68 and take away the sum of its digits. What do you get?
31. 31.Take 53 and take away the sum of its digits. What do you get?
32. 32.Take 39 and take away the sum of its digits. What do you get?
33. 33.110? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 51 and take away the sum of its digits. What do you get?
35. 35.Take 47 and take away the sum of its digits. What do you get?
36. 36.17? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 15 and take away the sum of its digits. What do you get?
38. 38.Take 78 and take away the sum of its digits. What do you get?
39. 39.?024 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.727? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks