Mathematics Number Forms and Place Value

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Period

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A group of three places in a number, usually separated by commas. The first three periods are the ones period, the thousands period, and the millions period.

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Standard Form

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The way a number is written with numerals. Example: 12,403

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Word Form

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The way a number is written with words or said aloud. Example: twelve thousand, four hundred three

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Digit

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Any of the numerals from 0 to 9, especially when forming part of a number.

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Expanded Form

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A way a number is written to show the place value of each digit. For example, 249 = 200 + 40 + 9. Example: 12,403 = (1 x 10,000) + (2 x 1,000) + (4 x 100) + (3 x 1) or 10,000 + 2,000 + 400 + 3

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Place Value

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The value assigned to a digit based on its position in a number. Example: the 2 in 324 is in the tens place and has a value of 2 tens or twenty.