I started my kindergarteners with math journals this year. I'm using spiral notebooks and everyday we get a new prompt and write, draw, color it together! So far it's working really well and they're showing me some great things. I print my journal prompts on return address labels and give each student a label when they're shown me they are on the right page (not the middle of the notebook). I've been focusing on the basic colors, shapes, and patterns for now and I created a full set of prompts ahead of time to keep on top of things. Here it is!