Multiplying Integers
Developing rules for multiplication of integers
Welcome to your FLIP over multiplying and dividing integers!
Mrs. Hawkins, Ms. McMeen, and Mrs. Perry are very excited about this new unit! We all know how hard you worked to be successful at adding and subtracting integers, and we believe you are ready for the next step!
let's talk about MULTIPLYING INTEGERS
Remember that multiplication is just repeated addition:
For example, 3 x 5 = 3 + 3 + 3 + 3 + 3 OR 5 + 5 + 5 <--They both equal 15
Now let's look at negative numbers...
-3 x 5 = (-3) + (-3) + (-3) + (-3) + (-3) = -15
Five copies of negative three added together is negative fifteen.
For example, 3 x 5 = 3 + 3 + 3 + 3 + 3 OR 5 + 5 + 5 <--They both equal 15
Now let's look at negative numbers...
-3 x 5 = (-3) + (-3) + (-3) + (-3) + (-3) = -15
Five copies of negative three added together is negative fifteen.
In a similar fashion, (-3) x 5 can be thought of as three backwards steps of length five.
What happens when we multiply a negative by a negative?
(-2) x (-5) is two BACKWARD steps of negative five on a number line.
Notice that the product of two negatives is a positive.