Scribe, Friday 10/12

Hi guys! Sirus here with the lesson from today.

OK. First point. The main point of today's lesson was to solidify our knowledge of the four main algebraic properties, the multiplication, division, addition, and the subtraction properties of equality.

The properties are stated thusly:
Multiplicative: If a = c, then ac = bc.
Division: If a = c, then a/c = b/c.
Addition: If a = c, then a+c = b+c.
Subtraction: If a = c, then a-c = b-c.

We also explored how writing about math helps you to understand it. These were the problems that we had to write about.

1) Explain how to undo multiplication in algebra.

2) What does x/2 signify?

3) Explain how solve for x and how to check x/3 = 4.

4) Come up with three algebraic equations for each property. You must use at least one negative number for each property, not for each equation.

5) You have two choices for this one.

1: If you aren't too familiar with the properties yet, try to solve the equations you created in number 4.
2: If you are familiar, write a word problem for each property.

Some of the problems that we came up with follow. Try them! (Be sure to define your variables)

1. There were a certain number of bees in the hive, until 3 left. After the 3 left, only 7 remained. How many bees were in the hive before the 3 left?

2. Bob had 144 skateboards. Now he only has one quarter as many as he did before. How many skateboards does he have now?

3. Mark had a certain amount of money. As he was walking to the store, a mysteriously heavy bag of money fell on his head, knocking him out and nearly concussing him. When he came to, somehow there was only $4 in the bag. If he now has $14, how much did he have before the bag fell on his head?

There is no homework. Since only 3 other people have at the moment accepted the invite, I nominate Marco to be the next Scribe.