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1 Out of 12 Is What Percent

# 1 Out of 12 Is What Percent

The question of how many out of 12 yields how many is 10%. So 10 out of 12 is 90%. The answer is 1 out of 12.

### Divide

This is all nice, but we usually do not use percents just by themselves. Mostly, we want to answer how big is one number in relation to another number?. To try to visualize it, imagine that we have something everyone likes, for example, a large packet of cookies (or donuts or chocolates, whatever you prefer ðŸ˜‰ - we will stick to cookies). Let's try to find an answer to the question of what is 40% of 20? It is 40 hundredths of 20, so if we divided 20 cookies into 100 even parts (good luck with that!), 40 of those parts would be 40% of 20 cookies. Let's do the math:

Although Ancient Romans used Roman numerals I, V, X, L, and so on, calculations were often performed in fractions that were divided by 100. It was equivalent to the computing of percentages that we know today. Computations with a denominator of 100 became more standard after the introduction of the decimal system. Many medieval arithmetic texts applied this method to describe finances, e.g., interest rates. However, the percent sign % we know today only became popular a little while ago, in the 20th century, after years of constant evolution. (Source: www.omnicalculator.com)

### Easily

Finally, what if you need to know the percentage change (increase or decrease) between amount or size "X" and "Y"? An item you have been thinking of purchasing had cost \$249.95 and now costs \$199.95. The ratio is 249.95:199.95. What is the percent the price dropped? (We would ask what is the "discount?") We can easily flip the calculation on its head. Suppose the price had been \$199.95 and is now \$249.95 (199.95:249.95), what is the percent increase? Use Percentage Calculator 4

In Lesson 14 we saw how to use a calculator to solve percent problems. And in Lesson 18 we first introduced the method of proportions. In this Lesson we will see problems that anyone who understands percent can easily do mentally. Arithmetic is and always has been a spoken skill. (Source: www.themathpage.com)

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