7th Grade Math Review #2

Front

What is the mean of a set of data?

Back

The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.

Front

How do you calculate the mean of the data set (10, 28, 32, 59, 61)?

Back

Add the numbers: 10 + 28 + 32 + 59 + 61 = 190. Then divide by the count of numbers (5): 190 / 5 = 38.

Front

How do you determine the duration of time between two times?

Back

Subtract the start time from the end time, converting hours and minutes as necessary.

Front

If Mike left at 8:30 AM and returned at 3:45 PM, how long was he gone?

Back

He was gone for 7 hours and 15 minutes.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with given numbers.

Front

Evaluate the expression 5y + x when x=3 and y=-2.

Back

5(-2) + 3 = -10 + 3 = -7.

Front

What is the sum of 0.5 and 3.91?

Back

0.5 + 3.91 = 4.41.

Front

How do you write an algebraic equation from a word problem?

Back

Identify the unknown quantity and express the relationship using variables and numbers.

Front

Translate the sentence 'A number minus 10 is 15' into an algebraic equation.

Back

n - 10 = 15.

Front

What is an algebraic expression?

Back

An algebraic expression is a combination of numbers, variables, and operations.