Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 404 · 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.?065 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
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 69 and take away the sum of its digits. What do you get?
4. 4.55? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.4?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Take 39 and take away the sum of its digits. What do you get?
7. 7.?750 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.60?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.35?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 55 and take away the sum of its digits. What do you get?
11. 11.Take 62 and take away the sum of its digits. What do you get?
12. 12.?642 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 42 and take away the sum of its digits. What do you get?
14. 14.5?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 70 and take away the sum of its digits. What do you get?
16. 16.8?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 54 and take away the sum of its digits. What do you get?
18. 18.Take 11 and take away the sum of its digits. What do you get?
19. 19.?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.3?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 29 and take away the sum of its digits. What do you get?
22. 22.Take 68 and take away the sum of its digits. What do you get?
23. 23.Take 57 and take away the sum of its digits. What do you get?
24. 24.71? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.Take 12 and take away the sum of its digits. What do you get?
26. 26.35?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.3?76 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 51 and take away the sum of its digits. What do you get?
29. 29.Take 31 and take away the sum of its digits. What do you get?
30. 30.Take 97 and take away the sum of its digits. What do you get?
31. 31.?484 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 20 and take away the sum of its digits. What do you get?
33. 33.?869 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 58 and take away the sum of its digits. What do you get?
35. 35.?553 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 35 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. 38.274? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.?307 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.28?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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