Math Stretch Numbers 1-121

I was very fortunate to attend Laney Sammon's Guided Math session for our district's institute day.  One of the big ideas we discussed were "math stretches."  A math stretch is a way to get the children thinking about math when they walk into the classroom in the morning.  A group of first grade teachers and I developed a math stretch based on  the first grade Common Core objective of being able to start at any number and count on.  Attached is a grid we created.  The idea is to make it larger so that each student can write a missing number on the chart.  Then when we get together,  I can ask the children: What patterns did you noticed?  What information helped you choose the number you wrote in the box?