Counting money with US coins and dollars | 3rd grade math (TX TEKS) | Khan Academy

- [Instructor] Marcus
found the money shown

in his pants pockets.

This should be apostrophe
in his pant's pockets

before doing laundry.

What amount of money did
Marcus find in his pocket?

So pause this video and see
if you can count this up.

All right, now let's work
through this together.

So we could start with the dollars

and then go to the change,

or we could start with the change

and then go to the dollars.

Actually, we'll start with the change.

So we have a dime here, this is 10 cents.

We have a nickel, this is 5 cents,

and then we have two quarters,

each of these are 25 cents, 25 cents.

So if we add these up, 25 plus 25 is 50,

50 plus five is 55,

and then we have another
10 cents gets us 65 cents,

so we have a total of 65 cents,

if we just look at the change here,

and now when we look at the dollar bills,

we have $10 plus $5 is $15, $15.

Now, if we add $15 to 65 cents,

what we're going to end up with is $15.65.

Let's do another example.

So here we're told that Shimon
has $23.27 in her wallet.

Which of the following

could represent the amount
of money Shimon has?

You can only pick one answer.

So let's just actually
pause this video first

and try to do it yourself
before I do this with you.

All right, so let's try to work this out.

So here on the dollar bills,
just this part over here,

or maybe I should draw it like this,

just this part over here,

this is 20 plus one plus
another one, so this is $22.

And then I have four quarters,

four quarters, that's 25
plus 25 plus 25 plus 25,

so that's 25, add another you get 50,

then another 25, you get 75,

you add another, you get a whole dollar.

So this is another $1 right
over here, so that's $1.

So 22 plus $1, we get to $23.

$23 is this part, and let's
see how much changes here.

We have 10 cents, so
this is 10, this is 10,

this is five, one, one.

So let's see, 10 plus 10 is 20

plus five is 25, plus two here is 27,

so this is 27 cents.

So if we take the total on choice A,

we do get $23.27 if we add all of this up,

which is exactly what
she needed in her wallet

and they said choose one answer,

so this must be the answer.

But let's see why these don't work out.

So right over here on B,

I have 20, and then I have three $1 bills,

so this is $23 right
from the get go there,

and then I have more than four quarters,

just these four quarters over here

are going to be another dollar,
that would get us to $24

before we even count anything else.

So we're already above this amount,

so that's why we can rule that one out.

And then over here, well we
have $20 and five, that's $25.

Before I even count these
other two to get us to 27,

we're already more than $23.27,

so we can rule that one out as well.