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Playlist CAHSEE Math Test Prep: Number Sense 30 videos
CAHSEE Number Sense: Drill Set 1, Problem 1. How would he write the number in scientific notation?
CAHSEE Math Number Sense: Drill Set 1, Problem 2. The decimal 0.000035 can be written in scientific notation as...what?
CAHSEE Math Number Sense: Drill Set 1, Problem 3. Which of the following numbers is the largest?
CAHSEE Math 2.2 Number Sense 215 Views
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Description:
Number Sense: Drill Set 2, Problem 2. Which fraction equals 65 percent?
Transcript
- 00:03
Here's a boring, unshmoopy question you'll find on an exam somewhere in life...
- 00:07
Which fraction equals 65 percent?
- 00:10
And here are your potential answers...
- 00:17
OK, this question is really testing our Latin more than it's testing our math.
- 00:21
Well, let's carpe diem, shall we?
Full Transcript
- 00:24
It's okay, we don't have to have taken AP Latin...
- 00:26
we just need to recognize the word "per."
- 00:29
...and acknowledge that it's not the sound a cat makes. Well, it is, but it's spelled differently.
- 00:34
"Per" in this case refers to the relationship of one thing to another...
- 00:37
...as in... so many hairballs thrown up PER cat.
- 00:41
Okay, we might be reaching a bit... purrrrchance...
- 00:46
The second part of the word is "cent" and also does not refer to the thing cats
- 00:50
pick up when they're in heat.
- 00:51
So... non-cat-related question: How many years are in a CENTury? Yep. One hundo.
- 00:58
The root of the word is simply... one hundred.
- 01:01
Or... a third of that movie about a bunch of Spartans.
- 01:04
So 65 PERCENT is just 65 OF EVERY HUNDRED.
- 01:07
And we could write that as a fraction as 65 over 100.
- 01:13
But the question throws one little curveball at us -- they reduce the fraction.
- 01:16
And actually... they're kinda being jerks about it, because one of the options is 100
- 01:20
over 65... ...which might be correct in the southern
- 01:23
hemisphere where water goes down the drain in the opposite direction...
- 01:26
...but in North America, Europe and most of Asia, 100 over 65 is the INVERSE of the right answer.
- 01:33
Hopefully we've done enough of these reducing
- 01:35
fraction problems to notice the 5 and the 0 on the ends there... so we know they are
- 01:39
divisible evenly by 5... ...65 divided by 5 is 13...
- 01:43
...and 100 divided by 5 is 20. So we get 13 over 20 which is... ta-da!
- 01:48
Answer C.
- 01:49
Well done. You have got some major... cat skills.
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