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ACT Math 2.4 Pre-Algebra 461 Views


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Description:

ACT Math: Pre-Algebra Drill 2, Problem 4. Which of the following numbers is largest?

Language:
English Language

Transcript

00:03

A little birdie told us you wanted to shmoop a math problem...

00:08

Which number is largest? And here are the potential answers...

00:15

OK, this question is just asking whether or not we have mastered The Number Line.

00:19

The answer is going to be somewhere in the "7"s area ...around here...so this is where it's gonna live.

00:25

To get the answer, we just zip through the choices one by one.

00:29

First we have the absolute value of negative 7, which is just... 7.

00:33

7 and 3/8 -- ok, so we need to decimalize and we divide 8 into 3.

00:40

So three divided by 8 is 0.375... so 7.375. So it lives here.

00:49

7.5 is already decimalized for us. Woot. It lives here.

00:53

OK, now we have 7 and 1/12 -- well... just looking at this number, we don't need to

00:59

go through the hassle of doing the math.

01:01

We know 1/12 is less than 1/8, which we just did, and this one will be even smaller...

01:06

...so let's just punt it.

01:08

And lastly, we have 4/9 -- well... we know 4/8 is one-half, right?

01:13

But here we have 4/9, so we know it'll be LESS than a half...

01:17

or smaller than the 7.5 number here.

01:20

We don't have to blast out the math here either.

01:22

The largest is 7.5... and the answer is C.

01:25

As in, "Chewbacca's feeling left out."

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