Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 428 · 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. 1.38?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 28 and take away the sum of its digits. What do you get?
3. 3.55?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 20 and take away the sum of its digits. What do you get?
5. 5.Take 78 and take away the sum of its digits. What do you get?
6. 6.?250 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 65 and take away the sum of its digits. What do you get?
8. 8.Take 21 and take away the sum of its digits. What do you get?
9. 9.14?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.103? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.6?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.79? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.?512 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.3?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 72 and take away the sum of its digits. What do you get?
16. 16.1?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 13 and take away the sum of its digits. What do you get?
18. 18.1?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 59 and take away the sum of its digits. What do you get?
20. 20.5?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 64 and take away the sum of its digits. What do you get?
22. 22.Take 42 and take away the sum of its digits. What do you get?
23. 23.175? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.191? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.421? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.?718 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.40?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Take 70 and take away the sum of its digits. What do you get?
30. 30.36?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 48 and take away the sum of its digits. What do you get?
33. 33.Take 33 and take away the sum of its digits. What do you get?
34. 34.Take 61 and take away the sum of its digits. What do you get?
35. 35.Take 93 and take away the sum of its digits. What do you get?
36. 36.Take 90 and take away the sum of its digits. What do you get?
37. 37.226? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.8?51 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 66 and take away the sum of its digits. What do you get?
40. 40.Take 18 and take away the sum of its digits. What do you get?

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