# 10. Use arrays to create equal groups (A)

teaches Common Core State Standards CCSS.Math.Content.2.OA.C.4 http://corestandards.org/Math/Content/2/OA/C/4
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Solve problems using skip counting and repeated addition.

This lesson provides an opportunity for students to apply their knowledge and understanding of arrays to a real-life situation. Students are asked to help a friend solve a problem by organizing oranges into arrays and using skip counting and repeated addition strategies.

Key Concept students will use:

• Skip counting or repeated addition can be used to find the total number of objects in an array because there is the same number of objects in every row or column.

Skills students will use:

• When representing arrays with rows of 2 and 5, students may add to find the total and naturally point out a connection to skip counting by twos or fives. (Grade 2, Unit 8)

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they make connections between equal groups of objects and arrays and the concept of adding equal addends.

Students engage in Mathematical Practice 3 (Reason abstractly and quantitatively) as they make connections between equal groups of objects and arrays along with the concept of adding equal addends.

Key vocabulary:

• arrange
• arrays
• columns
• efficient
• equal groups
• equation
• rows
• skip counting
• strategy

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