Fractions are all about working with parts of numbers. Fractions break a whole number down into smaller pieces.

They are most often used in measurements. An inch is often broken down into sixteenths. We’ll have you understanding fractions and then adding, subtracting, multiplying and dividing them.

**Next lesson: **Fractions of a Whole

Continue learning.

Video Transcript:

Fractions are all about working with parts of numbers. Fractions break a whole number down into smaller pieces.

They are most often used in measurements. An inch is often broken down into sixteenths. We’ll have you understanding fractions and then adding, subtracting, multiplying and dividing them.

**Rational Numbers**

You’ve probably heard of them before. Another term for a fraction is a rational number. The word rational comes from the word ratio. In the case of rational numbers, it is a ratio of two integers. The integer on top is called the “numerator” and the integer on the bottom is called the “denominator”. There is an extra rule you must remember. The bottom number can never be 0. If there is a 0 on the bottom, the division doesn’t work.

**Decimals and Percentages**

Decimals and percentages are another way to work with numbers that are less than one. A decimal breaks down a whole number into parts of ten. You might have tenths, hundredths, thousandths, or any value of ten. The quick way to recognize a decimal is to look for the decimal point. All of the numbers to the right of the decimal point are parts of a whole number.

Why would we talk about percentages here? Percentages are only one step away from decimals. Percentages are decimals that have been multiplied by one hundred. If you see a value such as seventy-nine percent (79%), that value is the same as seventy-nine hundredths (.79). Percentages are usually used with number values between zero and one hundred percent. Zero percent is nothing and one hundred percent is an entire thing. If you read this whole page, you will have read one hundred percent of the page.