<p>When you write a check, you write out the number in words as well as in digits. To write a number in words, write the number in each period followed by the name of the period without the &lsquo;s&rsquo; at the end. Start with the digit at the left, which has the largest place value. The commas separate the periods, so wherever there is a comma in the number, write a comma between the words. The ones period, which has the smallest place value, is not named.</p>

<p><img alt="An image with three values separated by commas. The first value is “37” and has the label “millions”. The second value is “519” and has the label thousands. The third value is “248” and has the label ones. Underneath, the value “37” has an arrow pointing to “Thirty-seven million”, the value “519” has an arrow pointing to “Five hundred nineteen thousand”, and the value “248” has an arrow pointing to “Two hundred forty-eight”." src="https://openstax.org/resources/439aa96bc95f9d148cecd49e1d4d24f0433f708b" /></p>

<p>So the number&nbsp;37,519,24837,519,248&nbsp;is written thirty-seven million, five hundred nineteen thousand, two hundred forty-eight.</p>

<p>Notice that the word&nbsp;<em>and</em>&nbsp;is not used when naming a whole number.</p>

<p>HOW TO</p>

<p>Name a whole number in words.</p>

<ol style="list-style-type:decimal">
	<li>Step 1. Starting at the digit on the left, name the number in each period, followed by the period name. Do not include the period name for the ones.</li>
	<li>Step 2. Use commas in the number to separate the periods.</li>
</ol>

<p><strong>EXAMPLE&nbsp;1.4</strong></p>

<ol style="list-style-type:decimal">
	<li>
	<p>Name the number&nbsp;8,165,432,098,7108,165,432,098,710&nbsp;in words.</p>

	<p><strong>Solution</strong></p>

	<table summary="Table C2 3 Dimensions ">
		<tbody>
			<tr>
				<td>Begin with the leftmost digit, which is 8. It is in the trillions place.</td>
				<td>eight trillion</td>
			</tr>
			<tr>
				<td>The next period to the right is billions.</td>
				<td>one hundred sixty-five billion</td>
			</tr>
			<tr>
				<td>The next period to the right is millions.</td>
				<td>four hundred thirty-two million</td>
			</tr>
			<tr>
				<td>The next period to the right is thousands.</td>
				<td>ninety-eight thousand</td>
			</tr>
			<tr>
				<td>The rightmost period shows the ones.</td>
				<td>seven hundred ten</td>
			</tr>
		</tbody>
	</table>
	</li>
</ol>

<p>&nbsp;</p>

<p><img alt="An image with five values separated by commas. The first value is “8” and has the label “trillions”. The second value is “165” and has the label “bilions”. The third value is “432” and has the label “millions”. The fourth value is “098” and has the label “thousands”. The fifth value is “710” and has the label “ones”. Underneath, the value “8” has an arrow pointing to “Eight trillion”, the value “165” has an arrow pointing to “One hundred sixty-five billion”, the value “432” has an arrow pointing to “Four hundred thirty-two million”, the value “098” has an arrow pointing to “Ninety-eight thousand”, and the value “710” has an arrow pointing to “seven hundred ten”." src="https://openstax.org/resources/feb8ab539331a1881c8c1ae2278d94e0cdaa5bc1" /></p>

<p>Putting all of the words together, we write&nbsp;8,165,432,098,7108,165,432,098,710&nbsp;as eight trillion, one hundred sixty-five billion, four hundred thirty-two million, ninety-eight thousand, seven hundred ten.</p>

<p><strong>EXAMPLE&nbsp;1.5</strong></p>

<p>A student conducted research and found that the number of mobile phone users in the United States during one month in&nbsp;20142014&nbsp;was&nbsp;327,577,529.327,577,529.&nbsp;Name that number in words.</p>

<p><strong>Solution</strong></p>

<p>Identify the periods associated with the number.</p>

<p><img alt="An image with three values separated by commas. The first value is “327” and has the label “millions”. The second value is “577” and has the label “thousands”. The third value is “529” and has the label “ones”." src="https://openstax.org/resources/693d18c57f3ff724948f7b29e840bb3b79960d29" /></p>

<p>Name the number in each period, followed by the period name. Put the commas in to separate the periods.</p>

<p>Millions period: three hundred twenty-seven million</p>

<p>Thousands period: five hundred seventy-seven thousand</p>

<p>Ones period: five hundred twenty-nine</p>

<p>So the number of mobile phone users in the Unites States during the month of April was three hundred twenty-seven million, five hundred seventy-seven thousand, five hundred twenty-nine.</p>

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