Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 123 · 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 39 and take away the sum of its digits. What do you get?
2. 2.?956 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Take 21 and take away the sum of its digits. What do you get?
4. 4.Take 62 and take away the sum of its digits. What do you get?
5. 5.719? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Take 14 and take away the sum of its digits. What do you get?
7. 7.4?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.6?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Take 88 and take away the sum of its digits. What do you get?
10. 10.?785 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.51?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.Take 73 and take away the sum of its digits. What do you get?
13. 13.11?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.?232 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 12 and take away the sum of its digits. What do you get?
16. 16.Take 99 and take away the sum of its digits. What do you get?
17. 17.?886 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.22? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 16 and take away the sum of its digits. What do you get?
20. 20.Take 32 and take away the sum of its digits. What do you get?
21. 21.Take 57 and take away the sum of its digits. What do you get?
22. 22.Take 82 and take away the sum of its digits. What do you get?
23. 23.506? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 95 and take away the sum of its digits. What do you get?
25. 25.6?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 23 and take away the sum of its digits. What do you get?
27. 27.Take 36 and take away the sum of its digits. What do you get?
28. 28.4?89 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Take 29 and take away the sum of its digits. What do you get?
30. 30.?691 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.859? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.?542 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Take 33 and take away the sum of its digits. What do you get?
34. 34.365? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 74 and take away the sum of its digits. What do you get?
36. 36.Take 69 and take away the sum of its digits. What do you get?
37. 37.Take 13 and take away the sum of its digits. What do you get?
38. 38.Take 61 and take away the sum of its digits. What do you get?
39. 39.?502 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.4?09 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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