Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 725 · 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. 1.779? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 71 and take away the sum of its digits. What do you get?
3. 3.?578 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 66 and take away the sum of its digits. What do you get?
5. 5.Take 41 and take away the sum of its digits. What do you get?
6. 6.?133 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.6?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 92 and take away the sum of its digits. What do you get?
9. 9.33?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 53 and take away the sum of its digits. What do you get?
11. 11.4?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.8?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.429? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.5?43 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 38 and take away the sum of its digits. What do you get?
16. 16.Take 33 and take away the sum of its digits. What do you get?
17. 17.Take 56 and take away the sum of its digits. What do you get?
18. 18.Take 29 and take away the sum of its digits. What do you get?
19. 19.4?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.360? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 35 and take away the sum of its digits. What do you get?
22. 22.4?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.?080 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.?601 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.Take 49 and take away the sum of its digits. What do you get?
26. 26.Take 12 and take away the sum of its digits. What do you get?
27. 27.?883 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.?430 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Take 93 and take away the sum of its digits. What do you get?
30. 30.Take 80 and take away the sum of its digits. What do you get?
31. 31.733? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.57?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.?629 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.Take 42 and take away the sum of its digits. What do you get?
35. 35.Take 31 and take away the sum of its digits. What do you get?
36. 36.?291 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 77 and take away the sum of its digits. What do you get?
38. 38.510? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 60 and take away the sum of its digits. What do you get?
40. 40.54?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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