2.2+Inventing+a+New+Model

21/3/09 SM Negative numbers help us model many real world situations. How can I add Integers?

**Problem 2.2**

 * A. Use a chip board and black and red chips to find each sum. Draw series of chip boards to illustrate your work.**


 * B. Find two combinations of black and red chips that will simplify to represent the given integer. Draw series of chip boards to prove that each combination works.

C. Write each combination you found in part B as an addition sentence.** 1. -1 + -2 = -3 2. 2 + 3 = 5

**Problem 2.2 Follow Up**
-8 + __-4__ = -4 -11 & -5 = -16 = -16 is less than either of the numbers. 11+5 = 16 = 16 is greater than either of the numbers.
 * 1. What integer added to -8 gives a sum of -4?**
 * 2. Give two integers with a sum that is less than either of the two integers.**
 * 3. Give two integers with a sum that is greater than either of the two integers.**