Description
In lesson 6 students multiply two-digit multiples of 10 by two-digit multiples of 10 with the area model. In preparation for two-digit by two-digit multiplication, students practice the new complexity of multiplying two two-digit multiples of 10. For example, students have multiplied 20 by 10 on the place value chart and know that it shifts the value one place to the left, 10 × 20 = 200. To multiply 20 by 30, the associative property allows for simply tripling the product, 3 × (10 × 20), or multiplying the units, 3 tens × 2 tens = 6 hundreds (alternatively, (3 × 10) × (2 × 10) = (3 × 2) × (10 × 10)).
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Prerequisites
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3.NBT.2,
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3.NBT.3,
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3.NBT.A.2,
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3.NBT.A.3,
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3.OA.5,
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3.OA.7,
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3.OA.B.5,
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3.OA.C.7,
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4.NBT.1,
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4.NBT.5,
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4.NBT.A.1,
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4.NBT.B.5
Credits
From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 3, Topic B, Lesson 6.
Available from engageny.org/resource/grade-4-mathematics-module-3-topic-b-lesson-6; accessed 2015-05-29.
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