7th Grade Math Review

Front

What does the score of 2 represent in the context of John's and Kamira's game?

Back

The sum of John's score and Kamira's score.

Front

If chicken loses 10% of its weight during cooking, how do you calculate the weight of uncooked chicken needed to obtain a specific cooked weight?

Back

To find the uncooked weight, use the formula: Uncooked Weight = Cooked Weight / (1 - Loss Percentage). For 1,170 grams cooked, Uncooked Weight = 1,170 / (1 - 0.10) = 1,300 grams.

Front

How do you calculate the time it takes for hair to grow a certain length at a given growth rate?

Back

Use the formula: Time (months) = Desired Length (cm) / Growth Rate (cm per 2 months). For 22.5 cm at 2.5 cm per 2 months, Time = 22.5 / 1.25 = 18 months.

Front

What signed number represents the total loss of yards if a football team loses 5 yards on each of 3 consecutive plays?

Back

The total loss is represented by -5 (3) = -15 yards.

Front

How do you calculate Julie's hourly rate of pay based on her weekly earnings and hours worked?

Back

Total hours worked = (3 days * 10 hours) + (3 days * 7 hours) = 51 hours. Hourly rate = Total Earnings / Total Hours = $612 / 51 = $12.

Front

What is the formula for calculating the average of a set of numbers?

Back

Average = (Sum of all values) / (Number of values).

Front

Define absolute value in mathematics.

Back

Absolute value is the distance of a number from zero on the number line, regardless of direction. It is denoted as |x|.

Front

What is the difference between a sum and a difference in mathematics?

Back

A sum is the result of adding two or more numbers, while a difference is the result of subtracting one number from another.

Front

Explain the concept of percentages in relation to a whole.

Back

A percentage is a way of expressing a number as a fraction of 100. It represents how much of a whole is being considered.

Front

What is a signed number?

Back

A signed number is a number that has a positive or negative sign, indicating its value relative to zero.