Question

What is the difference in length between 1 1/4 inch button and a 3/8 inch button

Answer 1

You have two buttons of different lengths.

First with length $1\dfrac{1}{4}$ in and second with length $\dfrac{3}{8}$ in. The first one is larger, then the difference in length between them is:

$1\dfrac{1}{2}-\dfrac{3}{8}=\dfrac{3}{2}-\dfrac{3}{8}=\dfrac{3\cdot 4-3}{8}=\dfrac{12-3}{8}=\dfrac{9}{8}=1\dfrac{1}{8}\ in.$

Answer: $1\dfrac{1}{8}$ in.