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CAHSEE Math 3.3 Mathematical Reasoning 221 Views


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Mathematical Reasoning Drill 3 Problem 3. When adding these fractions without finding the lowest common denominator, which of the following is the best estimate of the exact sum?

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Transcript

00:03

Here's a shmoopy question you'll find on an exam somewhere in life.

00:07

When adding the fractions 3/7, 5/9 and 6/11 without finding the lowest common denominator,

00:14

which of the following is the best estimate of the exact sum?

00:18

And here are the potential answers...

00:23

Looks like this question is testin’ our estimatin’ skills.

00:27

Basically, we just have to look at each of

00:29

the fractions and come up with a rough estimate for how close they are to 1/9, 1/3, ½ or 2/3.

00:37

3.5 sevenths would be a half, so 3 sevenths is slightly under.

00:42

4.5 ninths would be a half, so 5 ninths is slightly over.

00:49

Anyway. You get the idea.

00:51

The answer is a bunch of halves… or C.

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