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 ID: 170476
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Bake Sale Cookies!
Finding multiple sets of fractional amountsSlide2
How do you use what you know about whole numbers to help you multiply a fraction??
3
x ? Slide3
Decomposition
What are some ways we could decompose:
25?
100? ?Slide4
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.
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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 …Slide6
Bake Sale!
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?Slide7
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?
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4
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How much is that?Slide9
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
=
9
4 4 4Slide10
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.Slide11
More practice