Ratios are when you compare one thing to another thing. For example 121.2 boys are born for every 100 girls in china. In the future this will make it very hard for men to find wives but oh well. We commonly see ratios in baking ( 1 quarter cup flour to 1 half cup milk) or in sports ( the Ottawa senators beat the Montreal Canadiens 10 to 0 ) if you are from Canada and like hockey you will know the reference in that last one. Go Sens Go!🥅🏒. That is all i can explain for ratios.