Ch 4 Writing and Solving Proportions

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 write a ratio?

Back

Ratios can be written in three ways: as a fraction (e.g., 4/10), with a colon (e.g., 4:10), or with the word 'to' (e.g., 4 to 10).

Front

What is a proportion?

Back

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

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Front

What is the formula for finding a ratio of part to whole?

Back

The formula is: Ratio = Part / Whole.

Front

If there are 4 birds and 6 snakes, what is the ratio of birds to total animals?

Back

4/10 or 2:5.

Front

In a recipe, if the ratio of milk to flour is 1.5:3, what is the simplified ratio?

Back

1:2.

Front

If a car travels 120 miles in 3 hours, what is its speed in miles per hour?

Back

Speed = Distance / Time = 120 miles / 3 hours = 40 miles per hour.

Front

If Seth used 5 cups of flour instead of 3, how many cups of milk should he use to keep the proportions correct?

Back

2.5 cups of milk.

Front

What is the ratio of dogs to all pets if there are 2 dogs, 4 cats, and 5 hamsters?

Back

2:11.