# 10. Divide decimals to solve currency conversion problems (A)

teaches Common Core State Standards CCSS.Math.Content.5.NBT.B.7 http://corestandards.org/Math/Content/5/NBT/B/7
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Apply what students know about dividing decimal numbers.

This lesson provides an opportunity for students to apply their knowledge and understanding of dividing decimals to a real-life situation. Students are asked to convert between a foreign currency and US dollars.

Key Concept students will use:

• You can divide decimal numbers using the same strategies as whole numbers.

Skills students will use:

• strategies for dividing larger whole numbers (Grade 4, Unit 2), (Grade 5, Unit 2)
• place value with decimals (Grade 5, Unit 4)
• dividing decimal numbers (e.g., Grade 5, Unit 10)

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they decontextualize real world situations, such as converting between currencies, and transform them into symbolical representations, in this case division problems. Students use the compensation method and their knowledge of place value to simplify the process of decimal division.

Key vocabulary:

• compensation
• convert
• currency
• dividend
• divisor
• quotient

Special materials needed:

• examples of different currencies
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