Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 469 · 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 92 and take away the sum of its digits. What do you get?
2. 2.7?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 27 and take away the sum of its digits. What do you get?
4. 4.Take 31 and take away the sum of its digits. What do you get?
5. 5.35?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.?949 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 95 and take away the sum of its digits. What do you get?
8. 8.Take 89 and take away the sum of its digits. What do you get?
9. 9.Take 45 and take away the sum of its digits. What do you get?
10. 10.32? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 93 and take away the sum of its digits. What do you get?
12. 12.?067 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 35 and take away the sum of its digits. What do you get?
14. 14.67?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 81 and take away the sum of its digits. What do you get?
16. 16.?448 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.314? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 24 and take away the sum of its digits. What do you get?
19. 19.8?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.696? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 74 and take away the sum of its digits. What do you get?
22. 22.?664 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 42 and take away the sum of its digits. What do you get?
24. 24.50?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.26?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 62 and take away the sum of its digits. What do you get?
27. 27.39?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 75 and take away the sum of its digits. What do you get?
29. 29.Take 87 and take away the sum of its digits. What do you get?
30. 30.7?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.?047 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.312? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 46 and take away the sum of its digits. What do you get?
34. 34.5?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 77 and take away the sum of its digits. What do you get?
36. 36.?992 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.9?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.?01 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 80 and take away the sum of its digits. What do you get?
40. 40.Take 22 and take away the sum of its digits. What do you get?

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