Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 124 · 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. 1.37?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 29 and take away the sum of its digits. What do you get?
3. 3.469? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.?663 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.801? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Take 17 and take away the sum of its digits. What do you get?
7. 7.Take 99 and take away the sum of its digits. What do you get?
8. 8.68?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.6?92 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.17?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 63 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 30 and take away the sum of its digits. What do you get?
14. 14.4?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 52 and take away the sum of its digits. What do you get?
16. 16.718? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 66 and take away the sum of its digits. What do you get?
18. 18.Take 49 and take away the sum of its digits. What do you get?
19. 19.Take 36 and take away the sum of its digits. What do you get?
20. 20.Take 33 and take away the sum of its digits. What do you get?
21. 21.6?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.536? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.?075 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 47 and take away the sum of its digits. What do you get?
25. 25.?192 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 41 and take away the sum of its digits. What do you get?
27. 27.2?19 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 90 and take away the sum of its digits. What do you get?
29. 29.240? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 60 and take away the sum of its digits. What do you get?
31. 31.?332 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.74?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.643? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.781? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 83 and take away the sum of its digits. What do you get?
36. 36.46?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 88 and take away the sum of its digits. What do you get?
38. 38.517? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.?910 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.87?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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