Lesson plan

Compute sums and differences in scientific notation by using the distributive and associative properties with an understanding of place value

teaches Common Core State Standards CCSS.Math.Content.8.EE.A.4 http://corestandards.org/Math/Content/8/EE/A/4
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Big Ideas: The properties of real numbers (commutative, associative, and distributive) can be used to rewrite expressions in ways that simplify or shed light on an expression. Properties of real numbers (commutative, associative, distributive) and properties of exponents can be used to simplify computations with numbers in scientific notation. This lesson builds on students' work with place value and representing numbers in scientific notation. This task uses the mass in grams of various objects. Students are given five masses and asked to reason about the sum or difference of several different pairs. This will set them up to discover how manipulating powers of ten can allow you to add or subtract without putting numbers in standard form. By finding the greatest and least sum or difference, students are also able to reason about the relative sizes of sums and differences based on the power of ten. The mathematical concepts in this lesson build towards adding and subtracting polynomials. Vocabulary: powers of ten, place value