Proportions and Percent Change

Front

What is a proportion?

Back

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

Front

How do you find a missing value in a proportion?

Back

To find a missing value in a proportion, you can cross-multiply and solve for the unknown.

Front

What is percent change?

Back

Percent change is a way to express how much a quantity has increased or decreased relative to its original amount.

Front

How do you calculate percent change?

Back

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

Front

What is the formula to find a percentage of a number?

Back

Percentage = (Part / Whole) × 100%.

Front

If 8 is 40% of a number, what is the number?

Back

The number is 20.

Front

What is 20% of 75?

Back

20% of 75 is 15.

Front

If a recipe calls for 1.5 cups of milk for every 3 cups of flour, how much milk is needed for 5 cups of flour?

Back

2.5 cups of milk.

Front

What is 30 as a percentage of 40?

Back

30 is 75% of 40.

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.