### Scribe Post for Jan.6 2008

Today in class Mr. Harbeck went over the homework we had to do on pg.41in our purple booklet.

Then Mr. Harbeck showed us how to use algebra tiles to answer additive and subtractive questions. Next he wrote some questions down for us to do in our

What are algebra tiles.

Algebra tiles are things you draw to show how you explained it instead of just answering it.

Here are some.

Now Mr. Harbeck showed us how to use Algebra tiles with a Additive equation and Subtractive.

I will be showing you a picture later but now I am going to tell you the steps first.

In a equation the rectangle is N,so don't put in the sign and the cubes are regular numbers.

Additive Example:

After you have drawn the Algebra tiles for N+3=5, you now add the negative cubes.

( ones with arrows). (Which is 3, because you add the opposite of + which is - )

Then you circle the zero pairs (red and white cubes) and put a x through them.

I didn't because its a picture but you can if you are writing it.

Now they are nothing.

Next you only have the rectangle and the = sign on the left and+2 on the right.

After that you combine them both so its reads rectangle = 2 positive cubes. N=2

Now here is a picture of what I just said

Subtractive Example:

After you have drawn the Algebra tiles for -3+N=7, you now add the positive cubes.

( ones with arrows). (Which is 3, because you add the opposite of - which is +)

Then you circle the zero pairs (white and red cubes) and put a x through them.

I didn't because its a picture, but you can if you are writing it.

Now they are nothing.

Next you only have the rectangle and the = sign on the left and +4 on the right.

After that you combine them both so its reads rectangle = 4 negative cubes. N=4

Now here is a picture of what I just said

I pick Justin.A for the next Scribe. Please comment

Then Mr. Harbeck showed us how to use algebra tiles to answer additive and subtractive questions. Next he wrote some questions down for us to do in our

**c****olorful booklet**.What are algebra tiles.

Algebra tiles are things you draw to show how you explained it instead of just answering it.

Here are some.

Now Mr. Harbeck showed us how to use Algebra tiles with a Additive equation and Subtractive.

I will be showing you a picture later but now I am going to tell you the steps first.

In a equation the rectangle is N,so don't put in the sign and the cubes are regular numbers.

Additive Example:

After you have drawn the Algebra tiles for N+3=5, you now add the negative cubes.

( ones with arrows). (Which is 3, because you add the opposite of + which is - )

Then you circle the zero pairs (red and white cubes) and put a x through them.

I didn't because its a picture but you can if you are writing it.

Now they are nothing.

Next you only have the rectangle and the = sign on the left and+2 on the right.

After that you combine them both so its reads rectangle = 2 positive cubes. N=2

Now here is a picture of what I just said

Subtractive Example:

After you have drawn the Algebra tiles for -3+N=7, you now add the positive cubes.

( ones with arrows). (Which is 3, because you add the opposite of - which is +)

Then you circle the zero pairs (white and red cubes) and put a x through them.

I didn't because its a picture, but you can if you are writing it.

Now they are nothing.

Next you only have the rectangle and the = sign on the left and +4 on the right.

After that you combine them both so its reads rectangle = 4 negative cubes. N=4

Now here is a picture of what I just said

I pick Justin.A for the next Scribe. Please comment

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