Homework 5/9

Addition and Subtraction Equations Games

http://www.kidsmathtv.com/learn/pre-algebra-subtraction-2-game-for-7th-grade-monster-board-game/

http://www.math-play.com/One-Step-Equation-Game.html

http://www.math-play.com/soccer-math-one-step-equations-game/one-step-equations-game.html

http://www.xpmath.com/forums/arcade.php?do=play&gameid=69 (click "start")

http://www.xpmath.com/forums/arcade.php?do=play&gameid=68 (click "start")

http://www.mathplayground.com/algebraequations.html

Videos for Wednesday, 4/6

Hello all! Please closely watch these videos that explain some of the logic behind solving equations.

https://www.khanacademy.org/math/algebra-basics/core-algebra-linear-equations-inequalities/core-algebra-solving-basic-equations/v/simple-equations

https://www.khanacademy.org/math/algebra-basics/core-algebra-linear-equations-inequalities/core-algebra-solving-basic-equations/v/solving-one-step-equations-2

https://www.khanacademy.org/math/algebra-basics/core-algebra-linear-equations-inequalities/core-algebra-solving-basic-equations/v/solving-one-step-equations

https://www.khanacademy.org/math/algebra-basics/core-algebra-linear-equations-inequalities/core-algebra-solving-basic-equations/v/one-step-equations

If there is time left in class, you may play an integer game, or you can visit khanacademy.org and try some of what you've learned today. Type "solving equations" in the search bar and it will give you several options for equations practice. The practice exercises have stars next to them.

Chapter 8 Review

Before I get into all the other stuff:

Here are the links for Orbit Integers (adding integers game) and Integer Warp (multiplying integers game). 

http://www.arcademics.com/games/orbit-integers/orbit-integers.html

http://www.arcademics.com/games/integer-warp/integer-warp.html

And now, some reminders for Chapter 8:

*Adding integers with the same sign - add them together and keep the sign

*Adding integers with different signs - find the difference of their absolute values; then, keep the sign of the number with the greatest absolute value

*Subtracting integers - Use the K.F.C. (Keep/Flip/Change) method to turn your subtraction problem into an addition problem; then, follow the steps above for addition

*Multiplying AND dividing integers - Same sign = positive; Different signs = negative

Coordinate plane - Walk into the building before you take the elevator (x,y)

Have an awesome break, guys!

Fried Chicken and... Subtraction?!

 

Scared of subtraction involving negative integers? Don't be - remember, it's just addition in disguise!

The rule for subtraction is:

Add the OpPoSiTe!


Who likes fried chicken? It's one of my all-time favorites. :)

Img: thebittenword.com

So... what does fried chicken have to do with subtracting integers? Check out this cool chart from passyworldofmathematics.com:


Then, solve your problem as an addition problem. Here are a few examples:

-5 - 3 = ?
-5 + (-3) = -8  ---> Both numbers are the same sign, so we can add like normal and keep the sign.

7 - (-2) = ?
7 + 2 = 9   ---> Again, both numbers are the same sign, so we can add like normal and keep the sign.

4 - 8 = ?
4 + (-8) = ?  ---> Now we've got addition with two different signs, so remember to use your absolute values!
The absolute values are 4 and 8. The difference between 4 and 8 is 4. Now, is it negative or positive? Look at the original number that had the greatest absolute value: -8. Since it's negative, we know the answer is -4.

Reminders for integer operations:
- Positive + Positive = Positive
- Negative + Negative = Negative
- Adding two numbers with different signs: Find absolute values. Determine difference between
  absolute values. Use the sign of the number that has the greatest absolute value.
- Change to addition and add the opposite (KEEP, FLIP, CHANGE). *Once you've turned your
   subtraction problem to addition, forget about the subtraction part. You are now solving an addition
   problem and should proceed with the rules above.

Homework 1/21/16

Homework 1/12