Unit 7: Ratios and Rates 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

What is a rate?

Back

A rate is a specific kind of ratio that compares two quantities with different units, such as miles per hour or price per item.

Front

How do you calculate a percentage?

Back

To calculate a percentage, divide the part by the whole and then multiply by 100. For example, to find 25% of 80, calculate (25/100) * 80.

Front

What is the formula for percent change?

Back

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

Front

If 70 is ___% of 350, how do you find the percentage?

Back

To find the percentage, use the formula: (Part/Whole) * 100. Here, (70/350) * 100 = 20%.

Front

What does it mean to find the unit rate?

Back

The unit rate is the quantity of one item per one unit of another item, often expressed as 'per' something, like miles per hour.

Front

How do you express a ratio in simplest form?

Back

To express a ratio in simplest form, divide both terms of the ratio by their greatest common divisor (GCD).

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

What is a proportion?

Back

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

Front

How do you convert a fraction to a percentage?

Back

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