On my white board, I have an oversized number line that I purchased from Mardels. I laminated it for durability and used Velcro to attach it onto my white board. My board is only long enough to go up to 40; however, I can easily take it down and put up numbers 40-80 etc.
Using clips I bought from Dollar Tree, I attached our position words like before (made a red arrow-stop and reverse), after (made a green arrow-go forward) and between (made to pieces of bread-what is the meat in the middle?). I have also made a “start” clip when we do counting on. Having these supplies out and ready, I could have a quick mini-lesson during calendar math, a formal lesson, or can use this if we have extra time. Plus, the kids love to manipulate the pieces themselves.
I have seen this type of tool in magnetic form at school stores…however, my white board is NOT magnetic =(