Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 936 · 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. 1.39?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.72?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.?154 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.19?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.3?16 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Take 23 and take away the sum of its digits. What do you get?
7. 7.77?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 43 and take away the sum of its digits. What do you get?
9. 9.Take 64 and take away the sum of its digits. What do you get?
10. 10.60?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.2?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 96 and take away the sum of its digits. What do you get?
13. 13.1?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.79? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.?475 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.3?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.?511 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 59 and take away the sum of its digits. What do you get?
19. 19.Take 11 and take away the sum of its digits. What do you get?
20. 20.14?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 19 and take away the sum of its digits. What do you get?
22. 22.Take 26 and take away the sum of its digits. What do you get?
23. 23.?600 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 25 and take away the sum of its digits. What do you get?
25. 25.Take 84 and take away the sum of its digits. What do you get?
26. 26.Take 13 and take away the sum of its digits. What do you get?
27. 27.91? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 22 and take away the sum of its digits. What do you get?
29. 29.?301 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.85?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 87 and take away the sum of its digits. What do you get?
32. 32.6?34 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 89 and take away the sum of its digits. What do you get?
34. 34.Take 66 and take away the sum of its digits. What do you get?
35. 35.Take 56 and take away the sum of its digits. What do you get?
36. 36.80? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 39 and take away the sum of its digits. What do you get?
38. 38.Take 45 and take away the sum of its digits. What do you get?
39. 39.?227 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.?533 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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