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3rd Grade Math10 chapters | 87 lessons

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Lesson Transcript

Instructor:
*Lynn Knott*

Lynn has taught 1st and 3rd grade and has a master's degree in Educational Leadership.

Decimal numbers can look funny and sometimes be confusing. In this lesson, you will learn how to read and write decimal numbers to the hundredths place.

You go to the grocery store with your mom to buy your favorite ice cream. The cashier says you have to pay $3.59 for your delicious treat. You wonder why the amount has a dot in the middle of it. This is a decimal number.

A **decimal number** is a number made up of a whole number and parts of a number. The whole number and parts of a number are separated by a symbol. This symbol is called a **decimal point**.

The decimal point may look like a simple dot, but it has an important job to do. It shows us which numbers are whole numbers and which are the parts. Your ice cream costs three whole dollars and fifty-nine parts of a dollar called cents.

**Place value** helps us understand better how decimals work. Place values on the left of the decimal point are named as values of ones, tens, and hundreds. These place values keep getting ten times bigger each time you move one place to the left. The numbers on the right of the decimal point are named tenths, hundredths, and thousandths. These numbers keep getting ten times smaller per place value. Place value determines how large or small a number may be.

You might think reading a decimal number is difficult or confusing, but it is actually pretty easy. We will use the number 63.45 for our example.

We can tell this number is made up of whole numbers and parts of a number. The sixty-three represents the whole number. We know this because it is on the left side of the decimal point. The forty-five is on the right of the decimal point. The five is two places away from the decimal point in the hundredths column. We would read this number as sixty-three and forty-five hundredths. Our number is not sixty-three point forty-five.

When writing a decimal number, look at the decimal point first. If the last number is two places away from the decimal point, it is in the hundredths place. The number 0.39 would be written as thirty-nine hundredths. The nine is the last number and is in the hundredths place. The number 0.92 would be written as ninety-two hundredths. Again, the two is the last number and falls in the hundredths place.

Okay, let's take a moment or two to review what we've learned. Decimal numbers can be found in many everyday places. You might see a decimal number at a restaurant, a gas station, or grocery store. You may hear your mom use a decimal number when she takes your temperature. Even your favorite radio station's name has a decimal in it.

We learned that a **decimal number** is simply a number with parts. Some are just parts of a whole number, and some have a combination of a whole number and parts of a whole number, with these parts being separated by a decimal point. Decimal numbers increase and decrease by ten depending on where the decimal point is placed. Read and write a decimal number like you would any other number. Soon, you will be a decimal number expert.

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3rd Grade Math10 chapters | 87 lessons

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