Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 590 · 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. 1.7?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.2?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 19 and take away the sum of its digits. What do you get?
4. 4.180? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 94 and take away the sum of its digits. What do you get?
6. 6.?680 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 27 and take away the sum of its digits. What do you get?
8. 8.Take 65 and take away the sum of its digits. What do you get?
9. 9.Take 14 and take away the sum of its digits. What do you get?
10. 10.Take 78 and take away the sum of its digits. What do you get?
11. 11.?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.?888 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.Take 37 and take away the sum of its digits. What do you get?
15. 15.Take 89 and take away the sum of its digits. What do you get?
16. 16.Take 96 and take away the sum of its digits. What do you get?
17. 17.56?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.?722 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.2?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.30?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 79 and take away the sum of its digits. What do you get?
22. 22.15?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.26?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.5?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.Take 39 and take away the sum of its digits. What do you get?
26. 26.Take 83 and take away the sum of its digits. What do you get?
27. 27.Take 97 and take away the sum of its digits. What do you get?
28. 28.Take 93 and take away the sum of its digits. What do you get?
29. 29.Take 26 and take away the sum of its digits. What do you get?
30. 30.39?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.41?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.?683 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 99 and take away the sum of its digits. What do you get?
34. 34.1?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.5?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.51?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 90 and take away the sum of its digits. What do you get?
38. 38.Take 31 and take away the sum of its digits. What do you get?
39. 39.Take 86 and take away the sum of its digits. What do you get?
40. 40.?262 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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