Math sorts are a great way to increase higher level thinking, sort ideas into categories, and provide independent practice of skills. I have a Math Center titled "Math Sorts" and use these sorts weekly to develop math skills and thinking skills. This set of 20 sorts includes Common Core aligned sorts for the following first grade standards:
1.OA.1
1.OA.2
1.OA.3
1.OA.4
1.OA.6
1.OA.7
1.OA.8
1.G.1
1.G.3
1.NBT.2
1.NBT.3
1.NBT.4
1.NBT.5
1.NBT.6