# Base Ten Structure

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In this unit students

• understand base-ten structure for whole numbers;

• multiply and divide multi digit numbers;

• look for and explain patterns in tables in terms of base-ten structure.

In this unit students extend their understanding of the base ten system. They work with multi-digit numbers to practice comparing, ordering, rounding, and writing numbers in expanded form. They begin on fluency with addition and subtraction of multi-digit whole numbers using the standard algorithm. More importantly, they extend their work with place value understanding and properties of operations to perform multiplication and division with multi-digit numbers. They illustrate and explain calculations using equations, arrays, and area models. As in Unit 4.1, students analyze and generate number patterns that follow given rules related to base ten structure.

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