To multiply a fraction multiply the numerators and denominators. The numerators are the numbers on top while the denominators are the numbers on the bottom. This means that 2 and 4 are the numerators while 3 and 7 are the denominators. So, multiply these numbers, 2*4=8 and 3*7=21. This means that the final answer is [tex]\frac{8}{21}[/tex]. Which is already in simplest form.
