So 4 marbles plus the 5 marbles.

I want to make sure that my students understand the concept of inverse relationships. He has 9 marbles before tripling.

Parentheses are not needed in the last two expressions because multiplication and division are done before addition and subtraction. For today's warm up, I encourage dialogue about expressing calculations in words.

I have each student divide their paper into quarters and label each box. We then walk through writing numerical expressions for the following: a twice the sum of five and seven b three times the result of subtracting four from nine c two less then the result of dividing fifteen by three d one more then five groups of two-fifths As I rotate and facilitate, I remind my students that when necessary, they should use parentheses to group the operation that need to be performed first.

Independent Practice Questions Closure 10 minutes Using cold calling, I call upon random students to discuss how they came upon their answers in the independent practice. We use "g" to represent the unknown quantity, Gwen's waiting time.

If students have trouble with 2, be sure that students break up the problem into 3 steps. I also make sure that my students know that there's more than one way to write a numerical expression.

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Write Mathematical Expressions