7th Math Review

Front

How much money did Anna have left in the jar after spending 75% of her savings?

Back

Anna saved $20 each month for 2.5 years. Total savings = 20 * 30 = $600. She spent 75% of $600 = $450. Money left = $600 - $450 = $150.

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 of total students to boys = 28:16 = 7:4.

Front

How do you calculate the sale price of an item after a discount?

Back

Sale Price = Original Price - (Discount Percentage * Original Price). For an $800 TV with a 24% discount: Sale Price = 800 - (0.24 * 800) = $608.

Front

How do you round a number to the nearest tenth?

Back

Look at the hundredths place. If it's 5 or more, round up. If it's less than 5, round down. Example: 23.542 rounds to 23.5.

Front

How do you calculate the total descent from a height above sea level to below sea level?

Back

Total descent = Height above sea level - Depth below sea level. Example: 533 feet to -10 feet = 533 - (-10) = 543 feet.

Front

What is the formula for calculating the percentage of a number?

Back

Percentage = (Part/Whole) * 100. Example: What is 25% of 200? = (25/100) * 200 = 50.

Front

What is the definition of a ratio?

Back

A ratio is a comparison of two quantities by division. It shows how many times one value contains or is contained within the other.

Front

What does it mean to simplify a fraction?

Back

To simplify a fraction means to reduce it to its lowest terms by dividing the numerator and denominator by their greatest common divisor.

Front

How do you find the greatest common divisor (GCD) of two numbers?

Back

The GCD is the largest number that divides both numbers without leaving a remainder. Example: GCD of 12 and 16 is 4.

Front

What is the definition of a discount?

Back

A discount is a reduction in the original price of a product or service, often expressed as a percentage.