Two Negatives Can Make a Positive
I don't not like pizza -- this means you do like pizza!!
It works for multiplication -- (-2)(-5) = 10.
BUT NOT FOR ADDITION AND SUBTRACTION
-2-5 = -7 (this can also be written as -2 + -5)
-2 + 5 = 3
This video shows examples of positives and negatives using the distributive property. Watch out for the negative signs -- the minus sign is the most common mistake in Math. You have to just know you are going to make that type of mistake and check for it ;)
The examples are:
5(1 + 2) = 5 + 10 = 15
5(x + 2) = 5x + 10
5(1 - 2) = 5 - 10 = -5
-2(x + 5) = -2x -10
-5(x - 2) = -5x + 10
-2(x + 5) -5(x - 2)
-2x -10 - 5x + 10 = -7x
while -2x + 5x = 3x
Tagged under: Math,distributive property,negative signs
Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.
Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip
Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans
1. Students enter a simple code
2. You play the video
3. The students comment
4. You review and reflect
* Whiteboard required for teacher-paced activities
With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.
Carry out a quickfire formative assessment to see what the whole class is thinking
Create interactive presentations to spark creativity in class
Student teams can create and share collaborative presentations from linked devices
Turn any public video into a live chat with questions and quizzes