Ch. 4.2 Hexagons
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Tuesday, November 17, 2009
Monday, November 16, 2009
Divisibility and Exponents
Divistibility Rules~
by 2- its ends in 0,2,4,6,8 for example, 84 is divisible by 2
by 3- if the sum of its digits is divisible by 3 for example, 9/3=3
by 4- if the last 2 digits are divisible by 4 for example,128 7*4=28
by 5- if it ends in 0, or 5 for example, 20 or 25
by 9- if the sum of its digits is divisible by 9 for example, 72/8=9
by 10- if the number ends in a 0 for an example 30
Factors~
10-1,2,5,10
21-1,3,7,21
24-1,2,3,4,6,8,12,24
31-1,31 -this is a prime number
A prime number is 1 and the number itself
Exponents~
Exponents can be used to show repeated multiplacation
3^7=3*3*3*3*3*3*3 3= base 7=exponent
-a power has two parts
-a base has an exponent
-the expression 3^2 is read "three to the second power
(-4)(-4)=8^2
by 2- its ends in 0,2,4,6,8 for example, 84 is divisible by 2
by 3- if the sum of its digits is divisible by 3 for example, 9/3=3
by 4- if the last 2 digits are divisible by 4 for example,128 7*4=28
by 5- if it ends in 0, or 5 for example, 20 or 25
by 9- if the sum of its digits is divisible by 9 for example, 72/8=9
by 10- if the number ends in a 0 for an example 30
Factors~
10-1,2,5,10
21-1,3,7,21
24-1,2,3,4,6,8,12,24
31-1,31 -this is a prime number
A prime number is 1 and the number itself
Exponents~
Exponents can be used to show repeated multiplacation
3^7=3*3*3*3*3*3*3 3= base 7=exponent
-a power has two parts
-a base has an exponent
-the expression 3^2 is read "three to the second power
(-4)(-4)=8^2
Divisibility, Factors & Exponents
Notes from today on divisibility rules and order of operations with exponents.
4 1, 4 2 Hex
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Thursday, November 12, 2009
intergers scribe #1
Intergers
multiplying intergers- a posotive * a positive = a positive
a negitive * a negitive = a positive
a negitive * a positive = negitive
a positive * a negitive = a negitive
8*7= 56
-8*-7=56
-8*7= -56
dividing intergers- a posotive / a posotive = posotive
a negitive / a negitive = posotive
a negitive / a posotive = negitive
a posotive / a negitive = negitive
24/12=2
-24/(-12)= 2
-24/ 12= -2
addition of intergers- same signs add and keep different signs subtract, take the sighn of the bigger number.
5+12= 17
-5+12= 7
subtraction of intergers- change subtraction to adding the opposite.
9 - 27= ____
9+ (-27)= -18
Tuesday, November 10, 2009
Integer practice with all four operations
Here are the slides with answers from our practice today.
Koosh Ball Integer Practice
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Monday, November 9, 2009
Multiplying & Dividing Integers
Lesson on multiplication and division of integers.
Multiplication & Division of integers
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