Standard Form, 2,138, Expanded Form, 2000 + 100 + 30 + 8, Word Form, Two Thousand One Hundred Thirty Eight, Compose, You can use addition to compose numbers., Round, When you round to the nearest 10 or 100, you determine a 10 or 100 that is close to the original number., Decompose, When you decompose addends, you break them apart to help find the sum., Odd Number, An odd number cannot be decomposed into two equal whole numbers., Even Number, An even number can be decomposed into two equal whole numbers., Place Value, The value of a digit based on its place in a number.

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