# 5. Estimate products and solve multiplication problems (A)

teaches Common Core State Standards CCSS.Math.Content.5.NBT.B.5 http://corestandards.org/Math/Content/5/NBT/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Estimate products and solve multiplication problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of the standard algorithm to a real-life situation. Students are asked to calculate the amount of garbage produced yearly for a variety of people based on the yearly average of 1,508 pounds.

Key Concept students will use:

• The standard algorithm can be a efficient way to solve multiplication problems.
• Estimation and place value can be used to determine the reasonableness of products.

Skills students will use:

• estimating partial products
• estimating total products
• multiplying with the standard algorithm

Students engage in Mathematical Practice 8 (look for and express regularity in repeated reasoning) as they estimate products and use the standard algorithm for multiplication.

Key vocabulary:

• algorithm
• digit value
• distributive property
• estimation
• multiplication
• partial product
• place value
• product
• standard algorithm

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