Family Support Materials. Unit: 2.5 Numbers to 1,000 (Grade 2). 2.5 Numbers to 1,000 Unit Goals Students extend place value understanding to three-digit numbers. Section A Goals Read, write, and represent three-digit numbers using base-ten numerals and expanded form. Use place value understanding to compose and decompose three-digit numbers. Section B Goals Compare and order three-digit numbers using place value understanding and the relative position of numbers on a number line. Represent whole numbers up to 1,000 as lengths from 0 on a number line. Read More Lessons Resources Assessments Practice Glossary Lessons Section A: The Value of Three Digits 1 Ho