Rates, Ratios, proportions and percents

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and then multiply by 100.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you find a percentage of a number?

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). For example, 50% of 20 is 20 * 0.50 = 10.

Front

What does 100% represent?

Back

100% represents the whole or total amount of something.

Front

How do you express 25% as a fraction?

Back

25% can be expressed as the fraction 1/4.

Front

What is the relationship between ratios and fractions?

Back

Ratios can be expressed as fractions, where the first quantity is the numerator and the second quantity is the denominator.

Front

If a recipe calls for a ratio of 2:3 of sugar to flour, how much flour is needed for 4 cups of sugar?

Back

If the ratio is 2:3, for every 2 cups of sugar, you need 3 cups of flour. For 4 cups of sugar, you need 6 cups of flour.

Front

What is the formula to calculate percent change?

Back

Percent change = (New Value - Old Value) / Old Value * 100.

Front

How do you convert 3/4 to a percent?

Back

To convert 3/4 to a percent, divide 3 by 4 to get 0.75, then multiply by 100 to get 75%.