Ratios and Proportions

Front

What is a ratio?

Back

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

Front

What is a proportion?

Back

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

Front

How do you find a unit rate?

Back

To find a unit rate, divide the quantity by the number of units. For example, if 10 apples cost $2.00, the unit rate is $2.00 ÷ 10 = $0.20 per apple.

Front

What is the formula for setting up a proportion?

Back

Front

If 10 people ordered soup and 23 ordered sandwiches, what is the ratio of soup to sandwiches?

Back

Front

If 115 people ordered sandwiches, how many ordered soup if the ratio remains the same?

Back

Front

What is a unit rate?

Back

A unit rate is a ratio that compares a quantity to one unit of another quantity, such as miles per hour or price per item.

Front

How do you convert a ratio to a fraction?

Back

To convert a ratio to a fraction, write the first quantity as the numerator and the second quantity as the denominator.

Front

What is the relationship between ratios and fractions?

Back

Ratios can be expressed as fractions, and two ratios are equivalent if their fractions are equal.

Front

If 12 girls have brown eyes and 10 girls have blue eyes, what is the ratio of blue-eyed girls to total girls?

Back