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CAHSEE Math 4.5 Number Sense 188 Views


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Description:

Number Sense: Drill Set 4, Problem 5. Solve the equation.

Language:
English Language

Transcript

00:03

And here's your shmoop du jour...

00:05

12/13 + 17/39 equals... what?

00:10

Here are the potential answers...

00:16

Short on words. Long on one very simple basic idea:

00:20

Did we realize that 13 evenly goes into 39 three times?

00:26

If we did, then this is... E.Z.

00:29

Relative of Jay-Z.

00:32

All we have to do is multiply the top and bottom of the first fraction by 3...

00:36

...and we get 36 over 39...

00:39

...plus 17 over 39...

00:41

...which is 53 over 39.

00:43

We could simplify it further to get rid of the improper fraction...

00:47

...but the question doesn't ask for it.

00:48

Answer C is our guy.

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