Percent Proportion Practice

Front

What is a percent?

Back

A percent is a way to express a number as a fraction of 100. It is denoted by the symbol '%'. For example, 50% means 50 out of 100.

Front

How do you find what percent one number is of another?

Back

To find what percent one number (A) is of another number (B), use the formula: (A/B) x 100.

Front

What is the formula to calculate the percentage of a total?

Back

The formula to calculate the percentage of a total is: (Part/Whole) x 100.

Front

If 30% of a number is 15, what is the number?

Back

To find the number, use the formula: Number = Part / (Percentage/100). Here, Number = 15 / (30/100) = 50.

Front

What does it mean to find a percentage increase?

Back

Finding a percentage increase means calculating how much a value has grown in relation to its original amount, expressed as a percentage.

Front

How do you calculate a percentage decrease?

Back

To calculate a percentage decrease, subtract the new value from the original value, divide by the original value, and multiply by 100.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.

Front

How do you set up a proportion to solve for an unknown?

Back

To set up a proportion, write two ratios equal to each other and cross-multiply to solve for the unknown.

Front

If you have 80% of a number and that equals 40, what is the number?

Back

To find the number, use the formula: Number = Part / (Percentage/100). Here, Number = 40 / (80/100) = 50.

Front

What is the tax amount on an item?

Back

The tax amount is calculated by multiplying the price of the item by the tax rate. For example, for a $100 item with a 5% tax rate, tax = $100 x 0.05 = $5.