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CAHSEE Math 6.2 Mathematical Reasoning 179 Views


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Description:

Mathematical Reasoning Drill 6, Problem 2. The arithmetic operation used to find the distance that Iron Man traveled during this time can also be used to solve which of the following problems?

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Transcript

00:03

When I shmoop, you shmoop, we shmoop…

00:07

Iron Man experienced a glitch with his new suit, and it took him a while to find the “stop” button.

00:13

In the meantime, he flew for 2.5 hours at an average speed of 325 mph.

00:22

The arithmetic operation used to find the distance that Iron Man traveled during this

00:26

time can also be used to solve which of the following problems?

00:30

And here are the potential answers...

00:35

So… This question is really about leverage –

00:37

it’s taking a constant and multiplying it by a rate.

00:40

If we were to solve the problem at hand, where Iron Man traveled 325 miles in ONE hour…

00:45

…we’d multiply that number by 2.5 to find out how far he traveled in 2.5 hours.

00:50

So… which one of our choices does the same thing?

00:53

To solve A, we’d use real basic addition… so that answer is clearly a decoy.

00:58

To solve B, it’s basic subtraction. Also not going to cut the mustard.

01:03

What about C? A nickel for each student… five cents times 25…

01:08

so we’re looking at multiplication here. Just as we hoped.

01:11

We’re guessing choice D will be a dud… and sure enough, we’d need to use division to solve it.

01:17

So… C it is.

01:18

As in… “Check the User’s Manual.”

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