**Common Core Standard 7ns.2.b**

**Help, when I multiply or divide positive and negative integers I don’t know if the answer is positive or negative.**

Fortunately there are rules to help with this. Two quick and easy ways to remember the rules.

**Method 1**

Negatives always come in pairs.

**Method 2**

” Same signs = positive “

“Different signs = negative”

**Here are a few examples of multiplying positive and negative numbers.**

-4×5= -20

5 x -2= -10

-8x-3 = 24

**Multiplying a negative number by zero**Whenever you multiply a number by zero your answer will be zero. Regardless if the number is positive or negative, the answer is zero.

**For example:**

3 x0 = 0

-5 x 0 = 0

-456 x 0 =0

**Multiplying negative numbers and exponents**Whenever you have a negative base and an exponent you need to be on the lookout for parenthesis.

If you have a negative base and parenthesis, the parenthesis applies to the base. An example will help.

( -6^2) = -6 * -6 =36

compare this to

-6^2 = -6 * 6 = -36

-4^2 = -4*4= -16

compare this to

(-4^2) = -4 * -4 = 16

**Remember**

****Same signs = Positive**

**Different signs = Negative****Multiplying Negative Numbers and Fractions**

Remember our rules for multiplying positive and negative numbers?

These same rules apply to fractions. For example:

(-1/6) * 2/3 = -2/18 = -1/9

(-1/6) * (-2/3) = 1/9

1/6 * 2/3 = 1/9

**** Negatives come in pairs**