Monday, November 9, 2009

Today in math, we learned about exponents. Exponents can be used to show repeated multiplication. For example: 2 to the 5th power=2*2*2*2*2=32 NOT 2 to the 5th power is equal to 10. We learned that a power has two parts: the base and an exponent. The base is the main number, and the exponent is the raised number.
Examples:
4*4*4*4= 4 to the fourth power
3*x*y*y=3xy to the second power
We also went over the divisibility rules for numbers 1,2,3,4,5,9, and 10.
Examples:
1: every number is divisible by 1
2: ends in 0,2,4,6,8,10
3: sum of digits are divisible by 3
486~~~4+8+6=18 is divisible by 3
4: last 2 digits are divisible by 4
594~~~9+4=13 is not divisible by 4
5: ends in 5 or 0
9: sum of digits are divisible by 9
548~~~5+4+8=17 is not divisible by 9
10: ends in 0
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5 comments:

  1. Quillen BradleeNovember 11, 2009 at 6:09 PM

    Yesterday in class we learned about prime numbers, composite numbers and the GCF of a number. A prime number is a positive integer that is not divisible without remainder by any integer except itself and 1, for example 7 is a prime number because its only factors are 1 and itself. A composite number is a number that is a multiple of at least two numbers other than itself and 1, an example of a composite number is 20 because its factors are 4, 5, 1, 20, 2 and 10 but 7 would not be a composite number, neither would 3, 5, 13, 23 and many more. The GCF or greatest common factor of a number is the largest number that is a common divisor of a given set of numbers. An example of this that the GCF of 10 and 20 is 10 because 10 is a factor of both numbers and its the biggest factor for both numbers. Yesterday we also learned how to find the prime factorization of a number by doing the upside division rule. We also learned that you can find the GCF of 2 numbers by using a venn diagram.

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  2. Quillen BNovember 12, 2009 at 2:19 PM

    Nice detail. I like how you stated examples of what to do and what not to do

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  3. Elizabeth MNovember 12, 2009 at 2:22 PM

    I liked all the examples! And thet non examples. You did A REALLY nice job on the blog!

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  4. Duncan DNovember 12, 2009 at 2:24 PM

    This was very nice. You realy explained what we did in school yesterday.

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  5. Nathan GNovember 12, 2009 at 2:24 PM

    Vivid detail of the notes, keep up the good work!

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