# Unit 8 Equal Groups (Family Materials)

In this unit, students develop an understanding of equal groups as the foundation for multiplication and division in grade 3 and beyond. This understanding builds on students’ experiences with skip counting and finding the sums of equal addends.

Near the end of the unit, ask your student to do the following problems:

Write 2 equations to represent the total number of squares.

Questions that may be helpful as they work:

• How many rows?

• How many columns?

• How does each equation match the array?

## Section A Odd and Even

In this section, students build on their personal experiences with sharing equal groups of objects and making pairs to define the terms odd and even. They begin by noticing that some groups of objects can be made into two equal groups without a “leftover” and other groups can be made into two equal groups with “1 leftover.” They notice this same pattern when pairing objects. After the terms even and odd are introduced, students focus on justifying why a group has an even or odd number of members by showing whether the objects can be made into two equal groups, whether the objects can be paired without a leftover, or whether they can skip-count by 2 to count the total number of objects.