Percent & Proportions Test Review

Front

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

Back

To find a percentage of a number, multiply the number by the percentage (in decimal form). Formula: Percentage = (Part/Whole) x 100.

Front

How do you calculate simple interest?

Back

Simple Interest = Principal x Rate x Time. Where Principal is the initial amount, Rate is the interest rate (as a decimal), and Time is the number of years.

Front

What does it mean to round a number to the nearest cent?

Back

Rounding to the nearest cent means adjusting the number to two decimal places, where the second decimal place is rounded based on the value of the third decimal place.

Front

How do you find the percentage of a total?

Back

To find the percentage, divide the part by the whole and then multiply by 100. Formula: Percentage = (Part/Whole) x 100.

Front

What is sales tax?

Back

Sales tax is a percentage of the sale price that is added to the total cost of a purchase, collected by the seller and paid to the government.

Front

How do you calculate the total cost including sales tax?

Back

Total Cost = Price + (Price x Sales Tax Rate). Calculate the sales tax and add it to the original price.

Front

What is the relationship between fractions and percentages?

Back

A percentage is a fraction with a denominator of 100. To convert a fraction to a percentage, divide the numerator by the denominator and multiply by 100.

Front

What is the meaning of 'percent'?

Back

The term 'percent' means 'per hundred' and is used to express a number as a fraction of 100.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 25% = 25/100 = 0.25.

Front

What is the first step in solving a percentage problem?

Back

Identify the whole and the part. Determine what the percentage represents in relation to the whole.