In Unit 4, Connecting and Using Multiplication and Division, students will continue to deepen their understanding of multiplication and division. They will apply properties of multiplication and division as well as connect both operations. Students will demonstrate understanding in the context of multiplication and division story problems. Third graders will also apply the commutative, associative, and distributive properties to decompose, regroup, and/or reorder factors to make it easier to multiply two or more factors. Students represent expressions using various objects, pictures, words and symbols in order to develop their understanding of properties. This will show students that they can change the order of numbers to determine that the order of numbers does not make a difference in multiplication (but does make a difference in division). Given three factors, they investigate changing the order of how they multiply the numbers to determine that changing the order does not change the product. They also decompose numbers to build fluency with multiplication. Models will help students build understanding of the various properties.
We will also begin our work with elapsed time. In second grade, students learned to tell time to the nearest five minutes. In third grade, they extend telling time and measure elapsed time both in and out of context using clocks and number lines.
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