7th Math Review

Front

What is the total amount Anna saved in 2 1/2 years if she saves $20 each month?

Back

Total savings = 20 * 30 = $600 (2 1/2 years = 30 months).

Front

If Anna spent 75% of her savings on a computer, how much did she spend?

Back

Amount spent = 75% of $600 = $450.

Front

How much money did Anna have left after spending on the computer?

Back

Money left = $600 - $450 = $150.

Front

What is the value of the expression (−q² - r) / s if q = −2, r = −12, and s = 8?

Back

Value = (−(-2)² - (-12)) / 8 = (−4 + 12) / 8 = 8 / 8 = 1.

Front

What is the ratio of total students to boys in a class with 12 girls and 16 boys?

Back

Total students = 12 + 16 = 28; Ratio = 28:16 = 7:4.

Front

How do you solve the equation 12 - 3y = -6?

Back

Step 1: 12 + 6 = 3y; Step 2: 18 = 3y; Step 3: y = 6.

Front

What is the perimeter of a composite figure with a total length of 38 cm?

Back

Perimeter = 38 cm.

Front

What is the formula for calculating the perimeter of a rectangle?

Back

Perimeter = 2(length + width).

Front

What is the value of the expression 5x + 3 when x = 2?

Back

Value = 5(2) + 3 = 10 + 3 = 13.

Front

How do you find the area of a triangle?

Back

Area = 1/2 * base * height.