It is a big part of mathematical thinking to be able to sort and classify. Help your preschooler with this concept by having them match socks. Extend their thinking and discuss pairs and after you have all you matches count them up by two's.
You can use your laundry socks or go through your drawer to find socks with different colors, shapes, and patterns. Take out your holiday socks! knee high socks! and booties! Make sure they are not hooked together and dump them in one big pile. Sit down on the floor with your child and show them how to make a match. Put matches in a special place and continue.
Discuss colors, size, and pictures. Use the words: sort, match, big, and small. DOn't forget to also use words like fun and I love you!