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digit

any one of the ten symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 used to write numbers

period

each group of three digits in a number

place value

the value of a number based upon its place (or position) within the number

expanded form

a way to write numbers by showing the value of each digit

standard form

a way to write numbers using the digits 0 - 9, with each digit having a place value

written form

a number expressed in words

whole numbers

any number to the left of the decimal

base ten numeration system

base ten is the most used numeration system which is based on the digit ten