It is pretty easy to figure out percents; just divide the first number by the second number and then multiply by 100 and you get a percent. 100/140 is 71.4%.
First, you add up your percents; e.g. 80 + 90 + 70 = 260. Then, you divide that sum by the number of percent values you added; e.g. there were three percent values in the above example, 80, 90, and 70, so you would divide the above sum by three, 260 / 3 = 86.666.
It is finding an equivalent number whose denominator is 100.
you turn percents into mixed numbers by turning the percent into a fraction then a mixed number
Ratios are like the same thing as percents,you have to find a number out of another number, you dont have to be a mastermind to learn and teach them.