Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 213 · 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.?362 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 65 and take away the sum of its digits. What do you get?
3. 3.?950 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 27 and take away the sum of its digits. What do you get?
5. 5.155? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Take 62 and take away the sum of its digits. What do you get?
7. 7.75?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.?201 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.?670 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.?444 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 11 and take away the sum of its digits. What do you get?
12. 12.?134 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 32 and take away the sum of its digits. What do you get?
14. 14.Take 93 and take away the sum of its digits. What do you get?
15. 15.4?54 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.Take 55 and take away the sum of its digits. What do you get?
17. 17.Take 76 and take away the sum of its digits. What do you get?
18. 18.Take 20 and take away the sum of its digits. What do you get?
19. 19.9?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.7?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.?030 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 97 and take away the sum of its digits. What do you get?
23. 23.Take 94 and take away the sum of its digits. What do you get?
24. 24.6?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.136? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.68?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.101? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 21 and take away the sum of its digits. What do you get?
29. 29.Take 80 and take away the sum of its digits. What do you get?
30. 30.Take 23 and take away the sum of its digits. What do you get?
31. 31.?303 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.23? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 34 and take away the sum of its digits. What do you get?
34. 34.Take 96 and take away the sum of its digits. What do you get?
35. 35.Take 89 and take away the sum of its digits. What do you get?
36. 36.?327 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 68 and take away the sum of its digits. What do you get?
38. 38.Take 83 and take away the sum of its digits. What do you get?
39. 39.?536 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.750? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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