Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 62 · 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.?379 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 83 and take away the sum of its digits. What do you get?
3. 3.Take 23 and take away the sum of its digits. What do you get?
4. 4.Take 38 and take away the sum of its digits. What do you get?
5. 5.Take 12 and take away the sum of its digits. What do you get?
6. 6.?020 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 11 and take away the sum of its digits. What do you get?
8. 8.64?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.55? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.107? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 95 and take away the sum of its digits. What do you get?
12. 12.Take 56 and take away the sum of its digits. What do you get?
13. 13.?455 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.5?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.45? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.3?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.6?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 19 and take away the sum of its digits. What do you get?
19. 19.Take 88 and take away the sum of its digits. What do you get?
20. 20.Take 99 and take away the sum of its digits. What do you get?
21. 21.36?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.4?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.15?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 80 and take away the sum of its digits. What do you get?
25. 25.?534 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 20 and take away the sum of its digits. What do you get?
27. 27.Take 25 and take away the sum of its digits. What do you get?
28. 28.15?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.15?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 31 and take away the sum of its digits. What do you get?
31. 31.?566 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 76 and take away the sum of its digits. What do you get?
33. 33.?277 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.469? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 65 and take away the sum of its digits. What do you get?
36. 36.73?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 89 and take away the sum of its digits. What do you get?
38. 38.Take 68 and take away the sum of its digits. What do you get?
39. 39.?104 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 73 and take away the sum of its digits. What do you get?

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