Calculating savings | Personal financial literacy | 4th grade math (TX TEKS) | Khan Academy

- [Instructor] We are told
that Jamil earns $15 each week

for mowing lawns.

He saves $5 a week for a
video game that costs $27.

About how long will it take Jamil

to save for the video game?

Pause this video and have a go at this.

Alright, so let's think
about what's happening.

We know that he's earning $15,

but that's not what
he's saving every week.

It looks like he only saves five.

So he's spending 10 of those 15

and then he's keeping five
every week for that game.

So if we multiply the number
of weeks times $5 a week,

that's how much he saves.

So if we take five
weeks, times $5 per week,

this is going to be $25.

So that one's not enough.

Let's see, if we take six
weeks times $5 per week,

that gets us to $30.

Six times five is 30.

Well, that seems enough.

And if you do more than that,

he's going to just be saving
way more than he needs

for that video game.