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CAHSEE Math Videos 210 videos
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Description:
Number Sense: Drill Set 6, Problem 1. The root being squared must be between which two numbers?
Transcript
- 00:03
And here's your shmoop du jour...
- 00:06
The square of a whole number is between 900 and 1600.
- 00:10
The root being squared must be between... which two whole numbers?
- 00:14
Here are the potential answers...
- 00:16
Before we spoil the ending and kill all the drama... why not hit pause and try to solve it yourself?
Full Transcript
- 00:24
So... this is really testing our ability to recognize perfect squares.
- 00:29
It should be pretty obvious with all the double zeroes in here,
- 00:32
we may very well have a couple of them in our hands.
- 00:35
900 is 30 squared and 1600 is 40 squared.
- 00:39
But if you DIDN'T recognize them, we could have brute-forced the answer by just
- 00:43
taking each answer choice one by one until we find one that works.
- 00:48
9 squared is 81, which is below 900
- 00:51
Answer B gets us to the promised land.
- 00:54
If we were to keep going and square the 90 listed in choice C, we are already well above the minimum.
- 01:00
And since D is even higher, it's an easy reject.
- 01:02
Done. Answer B it is.
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