Lesson Plan

Solve addition and subtraction problems with decimals by using the standard algorithm

teaches Common Core State Standards CCSS.Math.Content.6.NS.B.3 http://corestandards.org/Math/Content/6/NS/B/3
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Idea: Using an algorithm can be an efficient way to add and subtract decimals. This lesson builds on students' previous work in 5th grade with decimals. In 5th grade students add and subtract decimals to the hundredths place using place value strategies, properties of operations and the relationship between addition and subtraction. The purpose of this standard is to allow 6th grade students to develop fluency with decimal operations using the standard algorithm.This builds towards students adding and subtracting rational numbers in 7th grade (7.NS.1). In this task, students will create three, 5-player scrimmage team using individual player's average points per game (APG). The students must create teams whose APG is less than 50 points and then calculate how many points they are from the 50-point cap. Successful use of the standard algorithm is the goal of this lesson. However, conceptual models should be used to make connections to the algorithm and lead to successful addition and subtraction of decimals using the standard algorithm. Vocabulary: Algorithm Difference Minuend Sum Subtrahend Addend
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