Lesson Menu Main Idea Key Concept:Divide by Fractions Example 1:Divide by Fractions Example 2:Divide by Mixed Numbers Example 3:Real-World Example

Main Idea/Vocabulary Divide fractions and mixed numbers.

Key Concept

Example 1 Divide by Fractions Find Write in simplest form. Estimate ■ Think How many groups of are in 1?

Example 1 Divide by Fractions Multiply by the reciprocal of which is Divide out the common factors.

Example 1 Divide by Fractions Answer: Check for Reasonableness

Example 1 CYP Find Write in simplest form. A. B. C. D.

Example 2 Find Write in simplest form. Divide by Mixed Numbers Estimate Multiply by the reciprocal of which is. Rename a fraction greater than one.

Example 2 Divide by Mixed Numbers Divide out common factors. Multiply. Answer: Check for Reasonableness

Example 2 CYP Find Write in simplest form. A. B. C. D.

Example 3 To find out how many times it will need to be restocked with lids, divide FACTORY A bottling machine needs to be restocked with new lids every 2 hours. If the machine runs 19 hours, how many times will it have to be restocked with lids? __

Example 3 Estimate Use compatible numbers. 18 ÷ 3 ≈ 6 Rename the mixed numbers to fractions greater than one. Multiply by the reciprocal of which is. Divide out common factors.

Example 3 Check for Reasonableness 7 is close to 6. Answer: The lids will need to be restocked 7 times. Multiply.

Example 3 CYP BAKING Andrea is making brownies for her basketball team’s bake sale. The recipe calls for cup flour. She has 4 cups flour in all. How many batches of brownies can she make? __ A.5 batchesC. 6 batches B.5 batchesD. 6 batches __