Mathematical+Reflections,+p.+52+0910

AD 4/19/10 **Mathematical Reflection 3** 1. You can use a number lone to count the difference between two numbers. a. 5 - 9 = -4 b. -5 – 3= -8 c. -5 - (-3) = -2
 * Big Idea:** Negative numbers help us to model many real world situations.
 * Essential Question:** How do I find the difference between integers?

d. 5 – (-9) = 14

2. When adding two positive integers the sum will be positive. When adding two negatives the sum is negative. When adding opposites, like -3 + 3, the sum is always 0. When adding a positive with a negative the sum can be either positive or negative.

3. When subtracting a positive from a negative the difference is negative. When subtracting a negative from a positive the difference is positive. When subtracting two positives the difference is positive. When subtracting two negatives the answer is negative.

4. When adding or subtracting integers you can get either a higher or a lower number.

5. To get absolute zero count he spaces between the integer and zero. __Summary__ This investigation was good. I learned how to subtract negatives. I hope I learn something new too in investigation four.