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

Divisibility, Factors & Exponents

Notes from today on divisibility rules and order of operations with exponents.

4 1, 4 2 Hex

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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

Chapter 1 review

Ch 1 Review

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Integer practice with all four operations

Here are the slides with answers from our practice today.

Koosh Ball Integer Practice

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Multiplying & Dividing Integers

Lesson on multiplication and division of integers.

Multiplication & Division of integers

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Subtracting Integers

Notes from today's lesson on subtracting integers.

Subtraction of Integers

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