Here are some pictures:
I also love these trays! They came with our math curriculum! They help everything stay in one place!
We also added recording our numbers. After they counted out the spiders the students recorded it on a piece of paper. They could make a mark, draw a circle, whatever was easy for them. It was just another way to show how many they spiders they had. Sometimes the numbers matched and sometimes they didn't. So that was a great discussion starter.