estimate
A number close to an exact amount.
expanded form
A way to write numbers by showing the value if each digit.
period
Each group of three digits separated by commas in a multi-digit number.
round
To replace a number with another number that tells about how many or about how much.
standard form
A way to write numbers by using the digits 0-9 with each digit having a place value.
word form
A way to write numbers by using words.
compare
To describe whether numbers are equal to, less than, or greater than each other.
order
A particular arrangement or placement of things one after the other.
place value
The value of a digit in a number, based on the location of the digit.
