Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 331 · 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.?169 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.30?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.?491 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 42 and take away the sum of its digits. What do you get?
6. 6.?700 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 60 and take away the sum of its digits. What do you get?
8. 8.Take 43 and take away the sum of its digits. What do you get?
9. 9.Take 56 and take away the sum of its digits. What do you get?
10. 10.Take 93 and take away the sum of its digits. What do you get?
11. 11.Take 22 and take away the sum of its digits. What do you get?
12. 12.Take 27 and take away the sum of its digits. What do you get?
13. 13.Take 86 and take away the sum of its digits. What do you get?
14. 14.581? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.254? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.308? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 75 and take away the sum of its digits. What do you get?
18. 18.519? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 20 and take away the sum of its digits. What do you get?
20. 20.?061 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.?20 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.8?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 73 and take away the sum of its digits. What do you get?
24. 24.3?61 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.7?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.425? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.Take 95 and take away the sum of its digits. What do you get?
28. 28.Take 21 and take away the sum of its digits. What do you get?
29. 29.2?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.53?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.278? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 46 and take away the sum of its digits. What do you get?
34. 34.Take 50 and take away the sum of its digits. What do you get?
35. 35.Take 62 and take away the sum of its digits. What do you get?
36. 36.Take 70 and take away the sum of its digits. What do you get?
37. 37.?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.3?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 66 and take away the sum of its digits. What do you get?
40. 40.Take 47 and take away the sum of its digits. What do you get?

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