Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 105 · 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. 1.267? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 96 and take away the sum of its digits. What do you get?
3. 3.Take 86 and take away the sum of its digits. What do you get?
4. 4.Take 98 and take away the sum of its digits. What do you get?
5. 5.58?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Take 63 and take away the sum of its digits. What do you get?
7. 7.Take 46 and take away the sum of its digits. What do you get?
8. 8.Take 55 and take away the sum of its digits. What do you get?
9. 9.?302 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.?517 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 32 and take away the sum of its digits. What do you get?
12. 12.20?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.44?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.6?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.44?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.?322 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.21?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 95 and take away the sum of its digits. What do you get?
19. 19.Take 51 and take away the sum of its digits. What do you get?
20. 20.Take 27 and take away the sum of its digits. What do you get?
21. 21.2?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 16 and take away the sum of its digits. What do you get?
23. 23.Take 19 and take away the sum of its digits. What do you get?
24. 24.Take 49 and take away the sum of its digits. What do you get?
25. 25.?957 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 67 and take away the sum of its digits. What do you get?
27. 27.?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.?296 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 53 and take away the sum of its digits. What do you get?
31. 31.50?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.77?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 61 and take away the sum of its digits. What do you get?
34. 34.57?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.?034 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 31 and take away the sum of its digits. What do you get?
37. 37.Take 18 and take away the sum of its digits. What do you get?
38. 38.491? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.6?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.?381 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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