I can create algebraic expressions from a word problem.

Hello. For today's problem, we're going to need our math,

interactive notebook and a pencil.

You might also have to pause from time to time

to write something down.

Go ahead and write down our learning target.

I can create an algebraic expression from a word problem

and problem of the day.

We have been writing unit bars, followed by an equation.

Today we're going to combine unit bars.

I kind of still do the same thing with an

equation. So how do we create an equation To represent

the problem?

Write down the following Where problem One gallon of orange

juice costs $6 stand spends $23 for three gallons of

orange juice and a bag of spinach.

Write an equation that can be used to find s

the cost of spinach in dollars.

You may pause if you need more time to write.

Step one creating model for the problem.

Write down the following unit bars and I will explain

here in a minute.

Step two.

We're going to write an equation to match the problem.

So let's take a look at that.

You know that unit bar that you just wrote down

23 is the total amount that stands spent.

In problem of the day, we would have isolated that

23 put it outside our unit bar and then add

some more information inside that unit bar.

So right now, 23 is representing the whole the total

amount. That's why it's taking up the whole unit bar.

Then we connected a second unit bar, which are the

parts six plus six plus six, which represents the three

gallons of orange juice stands spent.

He also spent and unknown amount off for spinach which,

being which is being represented by the unknown variable s.

So what does this look like when we write an

equation, we'll hear some possible equations.

23 equals six plus six plus six plus s is

representing exactly what we just saw.

However, we can also write it down as 23 equals

six times three plus s six times three is representing

the repeated edition of six plus six plus six.

Or we can flip it so that we can have

an equation in the way we normally see it six

times three plus s equals 23.

But what if none of these possible equations were part

of your answer choices.

If you have multiple choice remembering problem of the day,

we have been flipping our symbols.

So here's another way to look at it, and that

is to use fact families notice.

This time that 23 is part of my expression and

s is on the right side of our are equal

sign, but it still comes out to the same answer.

23 minus parentheses, six times three close parentheses equals s.

And why did we put as on the opposite side

of the equal sign?

Well, that's because we're trying to find out how much

we spent on spinach.

Let's try another example.

Write this down.

It takes Mrs Cox 14 hours to make one blanket.

Last month, she spent 70 hours making blankets.

Mrs. Cox sold each blanket for $35.

Mrs. Cox uses this equation to find D the total

amount total number of dollars she earned from blanket sales

last month.

Remember to pause if you need more time to write,

so let's see what that looks like in the unit

bar. Step one.

In model math drawing, I would have put the total

hours outside of my unit bar.

But right now I'm putting 70 hours inside my unit

bar representing the whole the total amount, followed by 14

hours, which is representing just one of those blankets.

But I need to find out how many blankets I

made in those 70 hours.

Then I had to make another unit bar because once

I found out how Maney blankets I made now I

need to find out how much each of those blankets

brought in for a total sale.

Step two, When I made when Mrs Cox made one

blanket, she made $35.

When she made her second blanket, she made $35.

When she made her third blanket, she made $35 and

so on.

So we have 35 plus 35 plus 35 plus 35

plus 35 equals How much she earned.

We can write that equation as 35 times 70 parentheses.

70 divided by 14 close parentheses equals the amount she

earned. D.

So how many dollars did Mrs Cox earned from black

and sales?

We'll be sure to apply the correct order of operation

Step one.

We're going to write down the first step that we

just did.

70 divided by 14 equals five blankets.

Step two, 35 times five blankets equals 175.

So she earned $175.

Now it's your turn to try on page 180 on

your think up book, you're going to work.

The two problems that say try it.

I can create algebraic expressions from a word problem.

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