Writing Numbers Through 1,000

Lesson Plan - Get It!

Audio:

When you learned to count, you most likely learned to start counting with zero and then one, two, three, and so on.

These are called counting numbers.

The place value of the digits in a number helps you name the number in written form or write it using numerical form.

A number in written form is spelled out in words. A number in numerical form is written using digits.

First, review place value and what the digits in each place represent. As you watch the video below, listen for the answers to these questions.

• What is the pattern as place value spots get bigger, such as ones, tens, hundreds, or thousands?
• If a 9 is in the hundreds place, what value does it have?

To write the names of numbers through 1,000, you need to know how to say and write the following numbers.

Example

Use the written form to write the number 23.

• How would you write the number 20 in written form?
• How would you write the number 3 in written form?

Now, put the two of them together.

• How would you write the number 23 in written form?

If 20 is read as twenty and 3 is read as three, then 23 is read as twenty-three.

When you write two-digit numbers that do not end in a zero, such as 23, you use a hyphen within the word. 23 is written as twenty-three.

• Can you name two other numbers that would be written with a hyphen using the table above?

Write the names of the two numbers on paper.

If a number has three digits, such as 345, write the number of the hundreds first and then write the rest of the number.

It is essential to remember that the word and is not used when writing whole numbers. The word and is used when naming decimal numbers.

For example, 2.5 would be read as two and one half. When reading decimal numbers, the word and represents the decimal point (.).

Example

Use the written form to write the number 345.

• How many hundreds does this number have? 3

• What number comes after the named hundreds? 45

First, write the number of hundreds and then write the rest of the numbers.

345 is written as three hundred forty-five.

• What do you notice about the way forty is spelled?

The word forty represents four tens, but it is not spelled the same as the word four. Check the spelling of words to be sure you are writing them correctly.

Example

Write the number eight hundred nine in numerical form.

First, write the number of hundreds.

• How many hundreds does the number have?
• What number comes after the hundreds?

Write your number using the numerical form on paper.

Now, see if you wrote the correct number.

Eight hundred nine means eight hundreds plus nine ones. There are no tens, so don’t forget to write a zero in the tens place.

The number written in numerical form is 809.

• Why is it important to be able to write numbers in numerical form and written form?

Head to the Got It? section to practice writing numbers in numerical form and in written form.