Percent Proportion #3

Front

What is a percent?

Back

A percent is a way of expressing a number as a fraction of 100. It is denoted by the symbol '%'. For example, 50% means 50 out of 100.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.

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, to find 20% of 50, calculate 50 * 0.20 = 10.

Front

What is the formula to calculate the part in a percent problem?

Back

The formula is: Part = Whole × (Percent / 100). For example, to find 30% of 200, use: Part = 200 × (30 / 100) = 60.

Front

What is the formula to calculate the whole in a percent problem?

Back

The formula is: Whole = Part / (Percent / 100). For example, if you know that 15 is 30% of a number, use: Whole = 15 / (30 / 100) = 50.

Front

What is the formula to calculate the percent in a percent problem?

Back

The formula is: Percent = (Part / Whole) × 100. For example, if 25 is part of 100, then Percent = (25 / 100) × 100 = 25%.

Front

What is the missing part in the problem: 'What is 35% of 590?'

Back

The missing part is 'part', which is the amount we are trying to find.

Front

Solve the problem: '18% of 30 is what number?'

Back

The answer is 5.4.

Front

What is the missing part in the problem: 'What percent of 20 is 7?'

Back

The missing part is 'percent', which is the value we need to find.

Front

If Amanda has 70 inches of ribbon and needs 54% for her craft, how much ribbon does she need?

Back

She needs 37.8 inches.