Answer:
6 and 7
Explanation:
You first want to find the factors of 42. They are: 
1,2,3,6,7,14,21,42
The factor pairs are: 
- 1 & 42
 - 2&21
 - 3&14
 - 6&7
 
The only factor pair with consecutive numbers is 6 and 7. They are both less than 10 as well, so 6 and 7 works.