Lesson plan

# 9. Use skip counting with arrays (FP)

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.MP6 http://corestandards.org/Math/Practice/MP6
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Apply the skip counting strategy by rows to find the total number of objects in an array.

This lesson provides an opportunity for students to apply their knowledge and understanding of skip counting to a real-life situation. Students are asked to skip count by rows to find the total number of objects in each "sticker array."

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 or 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 skip counting.

Key vocabulary:

• array
• columns
• organize
• rows
• skip counting
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• 9. Use skip counting with arrays (FP)