Subtraction in Equivalent Expressions
Warmup
Activity #1
Practice the Distributive Law.
- Use the distributive property to write an expression that is equivalent to the expression.
- If you get stuck, consider drawing boxes to help organize your work.
(1.) 
(2.) 
(3.) 
(4.) 
(5.) 
Activity #2
Compare two Relations.
- Drag the number tiles (top right) in the boxes below to make a true statement.
- After doing so, use the pen
o r 
tool to illustrate how your statement is true.
- Create another true statement different from the one you created above.
- After doing so, use the PEN or TEXT tools to illustrate how your statement is true.
- Create another true statement different from the two you created above.
- After doing so, use the PEN or TEXT tools to illustrate how your statement is true.
- Create another true statement different from the three you created above.
- After doing so, use the PEN or TEXT tools to illustrate how your statement is true.
Activity #3
Apply the Properties of Operations to Generate Equivalent Expressions.
- Interact with the applet below to solve as many problems as you can.
For example, apply the distributive property to the expression 3 (2 + x) to produce the equivalent expression 6 + 3x.
Challenge #1
Kiran wrote the expression 
for this number puzzle: “Pick a number, add -2, and multiply by 5.” Lin thinks Kiran made a mistake. How can she convince Kiran he made a mistake?
(1.) Lin thinks Kiran made a mistake. How can she convince Kiran he made a mistake?
(2.) What would be a correct expression for this number puzzle?
Challenge #2
Here is a calendar for April 2017. Let’s choose a date: the 10th. Look at the numbers above, below, and to either side of the 10th: 3, 17, 9, 11.
(1.) Find the average of these four numbers. What do you notice?
(2.) Choose a different date that is in a location where it has a date above, below, and to either side. Average these four numbers. What do you notice?
(3.) Explain why the same thing will happen for any date in a location where it has a date above, below, and to either side.
Challenge #3
Kiran wrote the expression
– 10 for this number puzzle: “Pick a number, add -2, and multiply by 5.”
(1.) Lin thinks that Kiran made a mistake. How can she convince Kiran he made a mistake?
(2.) What would be a correct expression for this number puzzle?
Quiz Time
https://www.ixl.com/math/grade-7/add-and-subtract-linear-expressions