Why the open numberline is a total math game changer
If you've spent any time looking at modern elementary math homework lately, you've probably seen an open numberline and wondered where all the actual numbers went. It looks like a simple, blank horizontal line, which can be a bit confusing if you grew up using the traditional version where every single tick mark was meticulously labeled from zero to twenty. But honestly, once you see how this thing works, it's hard to go back to the old way. It is less of a rigid ruler and more of a mental sketchpad that helps people—kids and adults alike—actually visualize what's happening when we add or subtract. ...