Percent of Change

Front

Proportional Reasoning

Back

Using ratios or rates to compare quantities and decide if they change at the same rate. Example: If 3 notebooks cost $6, then 6 notebooks should cost $12 — the relationship is proportional.

Front

Part

Back

A portion or piece of a whole amount. Example: 25% of 80 → the part is 20.

Front

Whole

Back

The total or complete amount. Example: If 15 is 30% of a number, the whole is 50.

Front

Ratios

Back

A comparison of two quantities using division. Example: The ratio of red to blue marbles is 2:3.

Front

Equivalent Ratios

Back

Ratios that name the same comparison or relationship. Example: 1:2 and 2:4 are equivalent ratios because they represent the same relationship.

Front

Rates

Back

A ratio that compares two quantities with different units. Example: 60 miles per hour compares miles to hours.

Front

Proportion

Back

An equation showing that two ratios or rates are equal. Example: 2/3 = 4/6 is a proportion.

Front

Simple Interest

Back

The money earned or paid on a loan or savings using only the starting amount (principal). Example: I = P × r × t; $100 at 5% for 2 years = $10 interest.

Front

Tax

Back

Money added to a purchase that goes to the government. Example: A $20 book with 5% tax adds $1; total = $21.

Front

Markup

Back

The amount added to the cost price of an item to set the selling price. Example: A store buys shirts for $10 and adds a 50% markup → sells for $15.