# 5. Zoo Donation: Using place value strategies to solve multi-digit multiplication problems (A)

teaches Common Core State Standards CCSS.Math.Content.4.NBT.B.5 http://corestandards.org/Math/Content/4/NBT/B/5
teaches Common Core State Standards CCSS.Math.Content.4.OA.A.3 http://corestandards.org/Math/Content/4/OA/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Apply various place value representations to solve multi-digit multiplication problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of multiplication and place value to a real-life situation. Students are asked to multiply to determine the price of various crates of fish, determine the number of crates of each variety to purchase with a set donation, and then complete a chart with the answers they found.

Key Concept students will use:

• Place value understanding allows us to multiply multi-digit numbers in different ways.

Skills students will use:

• Muliltplication using arrays or area models
• Place vale decomposition with multiplication problems
• Reasoning with subtraction to determine combinations of answers

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they work to multiply prices of crates and determine what items should be purchased to spend a particular amount of money.

Key vocabulary:

• area model
• array
• base ten block
• cube
• decomposition
• flat
• place value
• representation
• rod

Special materials needed:

• Base ten blocks (if needed for certain student needs)
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