7th Grad math

Front

What is the formula to calculate a percentage increase?

Back

Percentage Increase = (New Value - Original Value) / Original Value * 100

Front

If a store buys an item for $15 and marks it up by 400%, what is the sale price?

Back

Sale Price = Original Price + (Markup Percentage * Original Price) = $15 + (4 * $15) = $75

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

How do you simplify the ratio of total students to boys if there are 12 girls and 16 boys?

Back

Total students = 12 + 16 = 28. Ratio = Total Students : Boys = 28 : 16 = 7 : 4 (simplified).

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

Cross-multiply the two ratios and set them equal to each other, then solve for the unknown.

Front

What is the value of the expression 6 * 8?

Back

48

Front

What is the value of the expression 2 + 2 * 10?

Back

2 + 20 = 22 (follow order of operations: multiplication before addition).

Front

If you have a proportion 2/3 = x/12, how do you find x?

Back

Cross-multiply: 2 * 12 = 3 * x, so x = 8.

Front

What is the simplest form of the ratio 16:28?

Back

Divide both sides by 4 to get 4:7.