PEDMAS

parenthesis, Exponets, Division and Multiplcation, Addition and subtraction

Easy way to remember (Please Excuse My Dear Aunt Sally)

xy-2zSquared good

4(5)-2(-8)squared good

4(5)-2(-64) good

20-2(-64) good

multiply before subtraction

take 2 x -64 =-128

18-(-128)

18+128

answer = 146

Basics:

adding a negative = subtracting a positive & vise versa

examples:

5+(-3) = 5-3 5-(-3)=5+3

2 2 8 8

From my math notes:

Operations on real numbers

1. Adding numbers

a. adding 2 positive numbers – add together to get a positive number ex. 1+1=2

b. adding 2 negative numbers – add the absolute values and the answer will be negative. ex. (-3)+(-3)= -6

c. adding a positive and a negative number – take the one with the biggest absolute value and subtract the smallest absolute value – the answer will have the sign of the higher absolute value ex. 3+(-8)=-11 and (-3)+8= 8-3=5

2. Subtracting numbers

Change the sign of what you are subtracting and change to addition ex. (-2)-6=(-2)+(-6)=-8

3. Multiplying or dividing numbers

a. positive x positive=positive

b. negative x negative=positive

c. positive x negative=negative

same sign=positive different sign=negative

Good Luck, it’s tricky at first!!!

85-3=-3+85

-2+45=45-2

or adding negs to negs

-2+-2=-4 here. it’s basically adding, then put a neg sign in front

here’s a little more tricky ex

4+-1=3 the same as saying 4-1=3 ur adding a subtracting # to 4.

Remeber multipling #’s with oppo signs is different from adding/sub # w/ oppo signs.

# x -# = another -#

4 x -4 = -16

-# x -# = positve #

-5 x -5 = 25 if u multiply two neg #s, its the same as if they were positive.

Hope this helped

when multiplying, visualize the plus and minus signs as just lines. The plus sign has two (one going up and down, and one going left and right), and the minus has one. Add them all up in your equation. If you have an even amount, the answer will be positive. If you have an odd amount, the answer will be negative. For example:

-1 x 3 = ?

here you have one line from the minus sign (1)

then two with the next plus sign (imagine positive numbers having invisible plus signs) (3)

that’s an odd amount of lines, so you know your answer is going to turn out negative.

-1 x 3 = -3

If it were -1 x -3 = ?

The 1 has one line with with minus sign (1)

The 3 has one line with the minus sign (2)

That’s an even amount of lines, so you know your answer will be a positive:

-1 x -3 = 3

I hope that helped

Remember there is a set of rules for add and subtract and a difference set for multiply and divide. It could be that you never really understood the rules.

you mean like multiplying?

negative x negative= positive ex: -3 x -3 = 9

negative x positive=negative -3 x 3 = -9

positive x positive=positive 3 x 3 = 9

negative/ positive = negative ex: -3/3 = -1

positive/negative= negative 3/-3=-1

Positive X positive always positive

Positive X negitive alway negitive

Negitive X negitive always positive

Hope this helps some.