Friday, November 6, 2009

Quick Races and Factor Trees

Today in math we didn't do a whole lot as we only had the one period.



  • The first thing we did was look at Leonard's post on the blog. He wrote about the Get Ready page and about how you have to read the questions carefully.

  • The next thing we did was do a couple quick races. More people got the answers quicker than they did yesterday. Here is an example of one of the quick races we did today.

128-462 The first thing you would do is subtract 128 from 462. That leaves you with 334. You then divide 334 by 2. Once you do that you get 167. You then add 167 and 128 together to get a total of 295 which would be the number inbetween 128 and 462. I think we did two quick races.

  • The next thing we did was go over the definitions for factors, product, prime factorization, and prime numbers.

The definition of:

  • Factors: Factors are the numbers you multiply to get the product. Ex. The factors of 10 would be- 1, 2, 5, and 10. You would probably use a factor tree to find the factors of a number.

  • Product: The product is the number you end up with after multiplying two numbers. Ex. 2x5+10. 10 would be the product.

  • Prime Numbers: Prime numbers are numbers that have only two factors, one and itself. Ex. 7. The factors of 7 are 1, and 7.

  • Prime Factorization- Prime factorization is a number writtn as the product of its prime factors. Ex. The prime factorization of 6 would be 2x3.

  • After talking about that we did some factor trees. Some of the numbers we used were 100, 256, 45, and 27.

  • The last thing we talked about was finding a perfect square. Here is the definition of a perfect square.
  • Perfect Square- A perfect square is a number that is the product of the same two factors. A perfect square has only an even number of prime numbers. Ex. to figure out if a number could be a perfect square you would use a factor tree. If the bottom numbers had an even amount of each number it is a perfect square.

At the end of class we were assigned page 85 numbers 5-12.

By the way...everybody should finish voting on the poll for the ELA blog. You only have 4 hours left!!

2 comments:

  1. Well done Andrea! You did well on the whole post, but I really appreciate the effort you put into breaking up your post into manageable chunks and also the thought put into the labels you chose.

    The first line of your post made me laugh. I guess I better pick up the pace eh?

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  2. Great job! Your scribe had a lot of details which helped me understand what you are doing. The colors you added made me want to read your scribe. One thing you could do next time is maybe put a picture, link, or video but other than that it was a nice post.

    Check out one of my scribe posts on our math blog:
    http://spmath81709.blogspot.com/2009/10/picture-i-chose-was-crayon-line-up.html

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