Number lines: An Asset in the Classroom

My 1st grade students are taught to design their very own number lines.  Students need to fully understand what is happening when using number lines.  Teaching them what the arrows at the end of each side of the number line mean can help them grasp the never ending concept of order, sequence, and patterns in numbers.  How can I use number lines in my classroom?  The following are 10 mathematical skills that students can use number lines to helped them understand how numbers work:

1. Subtraction
2. Addition
3. Patterns
4. Decimals
5. Concept of Zero
6. Integers (temperature, etc...)
7.  Word Problems
8.  Time
9.  Fractions
10. Length, width and other types of measurement

We danced (my students and I) to the Macarena this past week.  Afterwards, we were ready to go back to learning!  So much fun!  :)