I explain briefly what the commutative and associative properties of addition & multiplication mean.
Then we check if subtraction & division also have those properties -- turns out they don't. It's easy to prove that by using specific numbers and checking that the expressions given in the properties are not equal. For example, since 10 - 5 is not equal to 5 - 10, subtraction is not commutative.
After that, I go through examples where we check if two given expressions are equal for all values of the variable, using our knowledge of the properties of the operations. For example, is a + 5 equal to 5 + a?
Lastly, I simplify various expressions using the commutative and associative properties of addition and multiplication - and also the definition of multiplication.
Learn more pre-algebra with Math Mammoth Grade 7 Curriculum at http://www.mathmammoth.com/complete/grade_7.php - available as an instant download and as printed copies. Check out the free samples also!
Tagged under: Commutative Property,Associative Property,Algebra (Field Of Study),Subtraction,Multiplication,Division,Addition,Math,Expression
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