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CAHSEE Math Videos 210 videos
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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.
Number Sense: Drill Set 4, Problem 5. Solve the equation.
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?
Full Transcript
- 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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