Pin These number sorts are an amazing way for students to practice seeing numbers represented in a variety of ways. This gives them several visual representations of numbers, so that they have a more concrete understanding of number sense.
I think you could also have multiple pipe cleaners coming from one number and students have to show multiple ways to add numbers to get to that number. Counting with pipe cleaners and beads. Great for fine motor development too.
Come see how I do my estimation station and find lots more ideas for the day of school in a kindergarten or first grade classroom. This post includes both math and literacy activities for this fun day. You can grab a FREEBIE too!