Unit 5 Flashcard #2 Practice (Proportions)

Front

What is a proportion?

Back

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

Front

How do you find a percentage of a number?

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). For example, 20% of 45 is 0.20 * 45 = 9.

Front

What is the formula to convert seconds to minutes?

Back

To convert seconds to minutes, divide the number of seconds by 60.

Front

If 5.5 minutes equals 330 seconds, how many minutes are in 720 seconds?

Back

720 seconds is equal to 12 minutes.

Front

What does discount mean in terms of cost?

Back

A discount is a percentage of the cost that is subtracted from the total.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions state that two ratios are equal.

Front

How do you solve for an unknown in a proportion?

Back

Cross-multiply the known values and then solve for the unknown.

Front

What is the term for the part of a whole expressed as a fraction?

Back

This is called a ratio.

Front

What is the percentage formula?

Back

The percentage formula is: (part/whole) * 100.

Front

How do you express a fraction as a percentage?

Back

To express a fraction as a percentage, divide the numerator by the denominator and multiply by 100.