2.2+Inventing+a+New+Model


 * April 5, 2009**
 * A.R.**
 * Big Idea: Negative numbers help us model many real world situations**
 * Essential Q: How do I add integers?**
 * Notes: Black circle: +1 Red Circle: -1**


 * A. Use chipboard and black and red chips to find each sum. Draw a series of chipboards to illustrate your work. **


 * 1. –8 + -7**
 * 2. –8 + +7**
 * 3. +8 + -7**
 * 4. +8 + +7



B. Find the two combinations of black and red chips that will simplify to represent the given integer. Draw a series of chipboards to prove that each combination works.**
 * 1) **-3**




 * Problem 2.2 Follow Up:**

You have to add 4 to –8 and that gives the sum of-4.
 * 1. What integer added to –8 gives the sum of –4?**

-10 + 9 = -1 -32 + 8 = -23
 * 2. Give two integers with the sum that is less than either of the two integers.**

-39 - 7 = -46 -10 + 9 = -19
 * 3. Give two integers with the sum that is greater then either two of the integers.**