*Contributor: Erika Wargo. Lesson ID: 12822*

What is the highest number you can think of? A billion-gazillion? What's the biggest number you can write? Learning how to write large numbers is very important; you'll probably do it 1,000,000 times!

categories

subject

Math

learning style

Visual

personality style

Otter

Grade Level

Intermediate (3-5)

Lesson Type

Skill Sharpener

Did you know that the sun's diameter, or distance across, is one million, three hundred ninety-two thousand kilometers? How would you write that number using digits?

Did you know that if you can name a number in the hundreds, you can name a number in the thousands, millions, and even billions?

A three-digit number, such as 345, has three place value spots. It has the ones place, the tens place, and the hundreds place. 345 would be read "three hundred forty-five."

A good way to help with writing and reading larger numbers is to break the number into smaller parts. Each group of three numbers repeats the same three place-value numbers: hundreds, tens, ones.

Sometimes, commas (,) are used when writing numbers in word form if the number is equal to or greater than one thousand.

As you watch *Read Big Numbers*, from Math Coach, notice how the numbers with commas are read:

After the video, discuss with a parent or teacher how you would read these two numbers: 894 and 146,935.

Now, look at the place-value chart below and notice when commas are used:

hundred millions | ten millions | millions , |
hundred thousands | ten thousands | thousands , |
hundreds | tens | ones |

5 | 2 | 5, | 4 | 7 | 9, | 1 | 2 | 4 |

In the place-value chart above, you see the number 525,479,124. The place-value chart can help you read numbers.

Begin on the left-hand side and read the first three digits you see and what place value spot the last digit falls in: *Five hundred twenty-five **million**,*

Then read the next set of three digits:* four hundred seventy-nine **thousand**,*

Then read the last set of three digits: *one hundred twenty-four.*

hundred millions | ten millions | millions , |
hundred thousands | ten thousands | thousands , |
hundreds | tens | ones |

5 | 2 | 5, | 4 | 7 | 9, | 1 | 2 | 4 |

_{Five hundred twenty-five million,} |
_{four hundred seventy-nine thousand,} |
_{one hundred twenty-four} |

Now, read it all together: *Five hundred twenty-five million, four hundred seventy-nine thousand, one hundred twenty-four. *

Notice how only the place-value spots of the millions and thousands were read, not every place that had a digit. The comma does not represent the word “and” as the number is read.

Take a look back at the example at the beginning of the lesson.

*Did you know that the sun's diameter, or distance across the sun, is one million, three hundred ninety-two thousand **kilometers?** How would you write that number using digits?*

Use the place-value chart to help you. Most of the time when there is a comma in the word form of the number, there is also a comma in the digit form of the number.

There was one million, so the digit 1 is written in the millions place-value spot. 392 thousand is written, and since there were no hundreds, tens, or ones, place holder zeros are needed:

hundred millions | ten millions | millions , |
hundred thousands | ten thousands | thousands , |
hundreds | tens | ones |

1, | 3 | 9 | 2, | 0 | 0 | 0 |

So, one million, three hundred ninety-two thousand is written as 1,392,000.

Discuss with a parent or adult how to write fifteen million, nine hundred thousand, six hundred two. Then, look at the place-value chart below to check your answer:

hundred millions | ten millions | millions , |
hundred thousands | ten thousands | thousands , |
hundreds | tens | ones |

1 | 5, | 9 | 0 | 0, | 6 | 0 | 2 |

Next, you will practice writing numbers into the hundred million with interactive practice and games in the *Got It?* section.

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