Unit 4 Ratios-- Test Practice

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

How do you determine if two ratios are equivalent?

Back

Two ratios are equivalent if they simplify to the same fraction or if their cross products are equal.

Front

What is the ratio of girls to boys if there are 12 girls and the ratio is 2:3?

Back

If the ratio of girls to boys is 2:3 and there are 12 girls, then there are 18 boys.

Front

What is the missing value in the ratio table if the ratio is 4:1 and the first value is 16?

Back

The missing value is 4, because 16 divided by 4 equals 4.

Front

How do you solve for a missing value in a ratio?

Back

To solve for a missing value in a ratio, set up a proportion and cross-multiply to find the unknown.

Front

What is the formula to find the total number of items produced in a given time if the rate is known?

Back

Total items = Rate of production × Time.

Front

If a ratio is expressed as 2:5, what does this mean?

Back

This means for every 2 parts of one quantity, there are 5 parts of another quantity.

Front

How can you express the ratio 3:6 in simplest form?

Back

The simplest form of the ratio 3:6 is 1:2.

Front

What is the cross product of the ratios 2:3 and 4:6?

Back

The cross products are 2*6 and 3*4, which both equal 12, showing the ratios are equivalent.

Front

If a recipe requires a ratio of 1:4 for sugar to flour, how much sugar is needed for 2 cups of flour?

Back

For 2 cups of flour, you need 0.5 cups of sugar (1/4 of 2 cups).