This Blog exists for the collective benefit of all 7th grade math students. While the posts are specific to Mr. Chamberlain's class, we welcome comments from everyone. The more specific your question (including your own attempts to answer it) the better.
EVEN MORE WELCOME ARE ANSWERS FROM FELLOW STUDENTS. BLOG ON!
Total Pageviews
6,514
Wednesday, November 3, 2010
hw #2-8 Scientific Notation & Unit Review
You should be viewing the video tutors and doing your homework! You have plenty of time to get ready for the UNIT TEST... get to work!
This homework assignment and the UNIT REVIEW assignment are both posted on the mathchamber.com website.
I like how you asked the question. "Blogger's Etiquette" requires you to get back to me and let me know if thes responses helped!
"Solving for an exponent" can be a tricky proposition, so let's look at the problem another way.
In #27, the left side of the equation is on scientific notation, the right side is in standard form. If you were to convert the standard form "side" to scientific notation, you would get 1.0035 x 10^8, yes? So therefore, n=8, do you agree?
For #30, you can use a similar technique. If you convert the right side to scientific notation, what do you get? Is it clear what must be equal to n?
For #36, I agree that the wording is a bit odd. So let's give it a try using two arbitrary (i.e. chosen at random) numbers:
Case #1: Let's take 3.2 x 10^3, which is 3,200. Multiply by 100 and you get 320,000 which is 3.2 x 10^5, right?
Case #2: Let's take 4.8 x 10^-4, which is 0.00048. Multiply by 100 and you'll get 0.048 which is 4.8 x 10-2, right?
In Case #1, the exponent went from 3 to 5. In Case #2, the exponent went from -4 to -2.
So now, can we "generalize" from these two "specific" cases, what happens to the exponent when you multiply a number written in scientific notation by 100? I think you can!!
No apology required... if you ask a question on the blog you should check back sometime before the next class... the nature of this "forum" is that we are rarely here at the same time... if more of us would participate, it could be a great learning area.
I am having trouble with numbers 27, 30, and 36. How do you solve for an exponent? And number 36 is written weird.
ReplyDeleteI like how you asked the question. "Blogger's Etiquette" requires you to get back to me and let me know if thes responses helped!
ReplyDelete"Solving for an exponent" can be a tricky proposition, so let's look at the problem another way.
In #27, the left side of the equation is on scientific notation, the right side is in standard form. If you were to convert the standard form "side" to scientific notation, you would get 1.0035 x 10^8, yes? So therefore, n=8, do you agree?
For #30, you can use a similar technique. If you convert the right side to scientific notation, what do you get? Is it clear what must be equal to n?
For #36, I agree that the wording is a bit odd. So let's give it a try using two arbitrary (i.e. chosen at random) numbers:
Case #1: Let's take 3.2 x 10^3, which is 3,200. Multiply by 100 and you get 320,000 which is 3.2 x 10^5, right?
Case #2: Let's take 4.8 x 10^-4, which is 0.00048. Multiply by 100 and you'll get 0.048 which is 4.8 x 10-2, right?
In Case #1, the exponent went from 3 to 5. In Case #2, the exponent went from -4 to -2.
So now, can we "generalize" from these two "specific" cases, what happens to the exponent when you multiply a number written in scientific notation by 100? I think you can!!
Mr. C.
SORRY-I was out all day and got back at 6 to see that you had responded. THANKS, I really understand!
ReplyDeleteNo apology required... if you ask a question on the blog you should check back sometime before the next class... the nature of this "forum" is that we are rarely here at the same time... if more of us would participate, it could be a great learning area.
ReplyDelete