Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 633 · 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.Take 91 and take away the sum of its digits. What do you get?
2. 2.Take 72 and take away the sum of its digits. What do you get?
3. 3.?206 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.?579 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 27 and take away the sum of its digits. What do you get?
6. 6.Take 67 and take away the sum of its digits. What do you get?
7. 7.224? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.?857 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Take 58 and take away the sum of its digits. What do you get?
10. 10.14?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.?006 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 29 and take away the sum of its digits. What do you get?
13. 13.Take 38 and take away the sum of its digits. What do you get?
14. 14.674? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.?928 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.?085 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 62 and take away the sum of its digits. What do you get?
18. 18.Take 77 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 83 and take away the sum of its digits. What do you get?
21. 21.?736 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 93 and take away the sum of its digits. What do you get?
23. 23.Take 12 and take away the sum of its digits. What do you get?
24. 24.63?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.29?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.?190 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.25?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.3?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.5?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 68 and take away the sum of its digits. What do you get?
32. 32.Take 36 and take away the sum of its digits. What do you get?
33. 33.Take 44 and take away the sum of its digits. What do you get?
34. 34.Take 76 and take away the sum of its digits. What do you get?
35. 35.12?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.Take 26 and take away the sum of its digits. What do you get?
37. 37.71? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Take 81 and take away the sum of its digits. What do you get?
39. 39.?301 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.7?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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