Envisions Math Topic 2 Review

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

If the ratio of boys to girls is 2:3 and there are 25 girls, how many boys are there?

Back

17 boys.

Front

What is the constant of proportionality in the equation y = ⅜x?

Back

The constant of proportionality is ⅜.

Front

How do you find the total cost y for x sheets of stickers if each sheet costs $2.45?

Back

Use the equation y = 2.45x.

Front

What does it mean if two quantities are proportional?

Back

Two quantities are proportional if they maintain a constant ratio to each other.

Front

On a map, if 1 inch equals 10 miles, how do you calculate the actual distance between two cities that are 7 inches apart?

Back

Multiply the distance on the map (7 inches) by the scale (10 miles/inch) to get 70 miles.

Front

What is the formula for finding the total cost of items?

Back

Total Cost = Price per Item × Number of Items.

Front

What is an example of a proportional relationship?

Back

If you buy 3 apples for $1.50, the cost per apple is constant, showing a proportional relationship.

Front

How do you express a ratio in simplest form?

Back

Divide both terms of the ratio by their greatest common divisor.

Front

What is the difference between a ratio and a fraction?

Back

A ratio compares two quantities, while a fraction represents a part of a whole.