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Bake Sale Cookies! Bake Sale Cookies!

Bake Sale Cookies! - PowerPoint Presentation

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Uploaded On 2015-10-23

Bake Sale Cookies! - PPT Presentation

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

sale bake sets needed bake sale needed sets sugar granulated total fractions recipe fraction costumes unit upcoming write practice

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Presentation Transcript

Slide1

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.

=

++Slide5

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?

+

+

+

+

+

+

+

+

+

+Slide8

0

1

2

3

4

+

+

+

+

+

+

+

+

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