BAKE SALE COOKIES! FINDING MULTIPLE SETS OF FRACTIONAL AMOUNTS.

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Presentation transcript:

BAKE SALE COOKIES! FINDING MULTIPLE SETS OF FRACTIONAL AMOUNTS

How do you use what you know about whole numbers to help you multiply a fraction?? 3 x ?

DECOMPOSITION What are some ways we could decompose: 25? 100? ?

DECOMPOSITION Like whole numbers, fractions can be decomposed. Example: Here the fraction is decomposed into unit fractions. Let’s see how that can help us solve other problems. =++

BAKE SALE! I have to make a lot of cookies for an upcoming bake sale at our Spring Fling and realized I need to make four batches of my favorite recipe. While scanning the recipe I saw there were some fraction amounts …

Let’s focus on the granulated sugar. How much is needed for one recipe? Is that all that is needed for the bake sale? Why or why not? What number sentence could be used to find how much total granulated sugar is needed?

CALCULATING SETS OF For granulated sugar I would need: 3 sets of cup or 3 x What is another way to write that using only unit fractions? 3 x ( ) or: What does that look like on a number line?

Core Lesson How much is that?

Core Lesson I would need or 2 cups of granulated sugar. So 3 sets of 3 parts of 4 is 9 parts total 3 x = 3 x 3 1 = 9x 1 =

PRACTICE Designing costumes for an upcoming performance, the music teacher determined the lead singers’ costumes needed 5/8 of a yard of ribbon. If there are 3 lead singers, how much total ribbon is needed? Write an equation to represent the situation and explain your thinking.

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