TSI Percent and Proportions

Front

What is a proportion?

Back

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

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Front

What is the formula to calculate percent decrease?

Back

Percent Decrease = ((Original Price - New Price) / Original Price) x 100.

Front

If you earn $X every Y weeks, how do you find your earnings in Z weeks?

Back

Earnings in Z weeks = (Z / Y) * X.

Front

What is 80% of a number?

Back

To find 80% of a number, multiply the number by 0.8.

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.

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 find the missing value in a proportion?

Back

Set up the proportion and cross-multiply to find the missing value.

Front

What does it mean to scale a ratio?

Back

Scaling a ratio means multiplying both terms of the ratio by the same number to maintain the same relationship.

Front

What is the formula for finding the percent of a number?

Back

Percent of a number = (Percent / 100) * Number.