Pick up packages of Avery 77501 Labels (Clear Label Index Maker Clear Pocket Dividers) from your local office supply store along with a 3 ring notebook. Simply print the PDF I've created and you'll have durable stickers to put on your new dividers.
There are enough labels for each of the 26 CCSS catergories listed for 2nd grade math. That's 4 labels for Operations and Alegbraic Thinking (2.OA.1 - 2.OA.4), 10 labels for Number and Operations in Base 10 (2.NBT.1 - 2.NBT.9), 10 labels for Measurement and Data (2.MD.1 - 2.MD.10) and finally 3 labels for Geometry (2.G.1).
Then you're all set! When you find great products from other TpT sellers for 2nd grade math, you'll be able to quickly print the resource and add it to your newly organized binder. You'll have plenty of resources in an orderly fashion to meet your students needs in an efficient manner!
*There are enough labels to stick them on both sides of the divider tabs to help you navigate your notebook even more quickly. Alternatively, you could print one sheet and have enough labels for you and a co-worker. Enjoy!