Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 200 · 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.Take 89 and take away the sum of its digits. What do you get?
2. 2.?808 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 30 and take away the sum of its digits. What do you get?
4. 4.Take 98 and take away the sum of its digits. What do you get?
5. 5.Take 74 and take away the sum of its digits. What do you get?
6. 6.71?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 93 and take away the sum of its digits. What do you get?
8. 8.Take 44 and take away the sum of its digits. What do you get?
9. 9.24? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.407? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.?979 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.7?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 59 and take away the sum of its digits. What do you get?
14. 14.736? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.4?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.?444 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 19 and take away the sum of its digits. What do you get?
18. 18.8?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 42 and take away the sum of its digits. What do you get?
20. 20.Take 84 and take away the sum of its digits. What do you get?
21. 21.Take 23 and take away the sum of its digits. What do you get?
22. 22.2?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 16 and take away the sum of its digits. What do you get?
24. 24.?278 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.19?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 92 and take away the sum of its digits. What do you get?
27. 27.?152 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 37 and take away the sum of its digits. What do you get?
29. 29.Take 33 and take away the sum of its digits. What do you get?
30. 30.39?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.?547 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 68 and take away the sum of its digits. What do you get?
33. 33.?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 15 and take away the sum of its digits. What do you get?
35. 35.38?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.845? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 17 and take away the sum of its digits. What do you get?
38. 38.1?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 21 and take away the sum of its digits. What do you get?
40. 40.21?3 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