Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 881 · 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.?799 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 68 and take away the sum of its digits. What do you get?
3. 3.Take 40 and take away the sum of its digits. What do you get?
4. 4.87?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 22 and take away the sum of its digits. What do you get?
6. 6.144? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.762? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.?115 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.4?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.30?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.523? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 79 and take away the sum of its digits. What do you get?
13. 13.Take 47 and take away the sum of its digits. What do you get?
14. 14.?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.?223 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.36?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 26 and take away the sum of its digits. What do you get?
18. 18.42?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.44?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.69?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 16 and take away the sum of its digits. What do you get?
22. 22.?625 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 20 and take away the sum of its digits. What do you get?
24. 24.6?14 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.6?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 33 and take away the sum of its digits. What do you get?
27. 27.Take 36 and take away the sum of its digits. What do you get?
28. 28.Take 18 and take away the sum of its digits. What do you get?
29. 29.?926 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.13?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.65?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 37 and take away the sum of its digits. What do you get?
34. 34.Take 28 and take away the sum of its digits. What do you get?
35. 35.Take 85 and take away the sum of its digits. What do you get?
36. 36.Take 54 and take away the sum of its digits. What do you get?
37. 37.Take 80 and take away the sum of its digits. What do you get?
38. 38.197? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 55 and take away the sum of its digits. What do you get?
40. 40.Take 63 and take away the sum of its digits. What do you get?

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