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Lesson Plan

Add or subtract to compare measurements by modeling on a number line

teaches Common Core State Standards CCSS.Math.Content.2.MD.B.5
teaches Common Core State Standards CCSS.Math.Content.2.MD.B.6
teaches Common Core State Standards CCSS.Math.Practice.MP4
teaches Common Core State Standards CCSS.Math.Practice.MP6
teaches Common Core State Standards CCSS.Math.Practice.MP7
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Big Ideas: We can model the difference between two measurements using a number line. In this lesson students will compare objects against a ruler. They will be finding the difference between a ruler and an object that is longer than a ruler. Students will be observed to see how they compare objects to find the difference: counting up from the smaller, counting down from the larger, or using other math tools. Vocabulary: number line, equal spaces, compare, how much more, how much less Special Materials: student number lines 0-100 classroom number line (optional) measuring tools (optional)
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