# 10. Solve a two-step money story problem (A)

teaches Common Core State Standards CCSS.Math.Content.2.MD.C.8 http://corestandards.org/Math/Content/2/MD/C/8
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective: Use addition and subtraction to solve two-step money story problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of add and subtracting money amounts to a real-life situation. Students are asked to determine how much money Maya has left after she buys several school supplies at the store.

Key Concept students will use:

• We can use addition and subtraction to put together and take apart amounts of money.

Skills students will use:

• Adding money amounts to find the sum
• Subtracting money amounts to find the difference
• Determining whether to use addition or subtraction to solve money story problems

Students engage in Mathematical Practice 4 (Model with mathematics) as they use respresentations to show how they solved the application task. Students will need to use words, numbers, drawings (and labels), and number lines to show how they added or subtracted money amounts.

Key vocabulary:

• number line
• skip count
• story problem
• subtraction

Special materials needed:

• dollars and coins
• hundreds grid
• number lines
• problem solving chart (if necessary)
• scratch paper
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