select all common denominators of 1/4 and 7/10
To find the common denominators of 1/4 and 7/10, we can start by finding the least common multiple (LCM) of the denominators, which are 4 and 10.
The multiples of 4 are: 4, 8, 12, 16, 20, ...
The multiples of 10 are: 10, 20, 30, 40, ...
The least common multiple (LCM) is the smallest number that is a multiple of both 4 and 10. In this case, it is 20.
So, the common denominators of 1/4 and 7/10 are 20.