https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-negative-number-topic
Today's TO DO LIST
1. KA: Interpreting Negative Numbers
2. KA: Negative Numbers on the numberline
3. KA: Number Opposites
4. KA: Negative Symbol as Opposite
5. KA: Number Opposites CHALLENGE
6. KA: Quiz 2