Writing a whole number in expanded form expresses it as the sum of the values of its digits according to their places, such as , or . This connects numerals with hundreds, tens, and ones, including zero’s role as a placeholder, and supports composing, decomposing, and comparing numbers through 1,000; decimals and larger place-value systems are not included.
Expanded form shows the value of each digit in a number. Look at the digit’s place:
Example: Write in expanded form.
Add the place values:
We can leave out the when writing the sum:
The zero is still important because it holds the tens place.
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