7th Grade Math STAAR Review

Front

What does the equation 7 = 127 - 5b represent in a real-world scenario?

Back

It represents a situation where there were 7 players left over after 127 rugby players were divided into 5 teams with b players on each team.

Front

How do you calculate the cost of oil used if 60% of a 25-ounce bottle costing $5.88 is used?

Back

First, calculate 60% of 25 ounces: 0.6 * 25 = 15 ounces. Then, find the cost per ounce: $5.88 / 25 = $0.2352 per ounce. Finally, multiply the cost per ounce by the amount used: $0.2352 * 15 = $3.53.

Front

What inequality represents how many hours Sam needs to work to buy a laptop costing $550 if he earns $10.25 per hour?

Back

10.25h ≥ 550; Sam needs to work at least 54 hours.

Front

How do you calculate the interest earned on a $300 investment at 4% interest after 1 year?

Back

Interest = Principal x Rate = $300 x 0.04 = $12.

Front

What is the mode of a data set?

Back

The mode is the number that appears most frequently in a data set.

Front

What is the mean of a data set?

Back

The mean is the average of all numbers in a data set, calculated by dividing the sum of the numbers by the count of numbers.

Front

How do you find the difference between the mode and the mean of a data set?

Back

Calculate the mode and mean separately, then subtract the mean from the mode.

Front

What is a variable in mathematics?

Back

A variable is a symbol used to represent an unknown value, often denoted by letters such as x or y.

Front

What is an equation?

Back

An equation is a mathematical statement that asserts the equality of two expressions, typically containing variables.

Front

What is a percentage?

Back

A percentage is a fraction expressed as a part of 100, used to compare relative sizes.