Pinterest, with tons of searchable activities and lesson plans, is the perfect place to gather ideas for your classroom. Monica Burns recommends the following Pinterest pages for math teachers:

Math Games—This collaborative math games board features hundreds of pins for a variety of math games and activities.

Geometry Activities—Mr. Elementary Math has pinned lots of geometry classroom activities, including hands-on activities.

Math Food—This board from the Center of Math is full of ideas for showing how math connects to our favorite foods. There’s even a periodic table of desserts.

Colorful Math Lessons—Crayola has collected over a hundred pins to different math activities, many of which use crayons to teach lessons on a wide range of topics.

Addition Activities—United Teaching features tons of activities and ideas for math centers, from using manipulatives to new ways to use pocket charts and playing cards.

Math Outdoors—This page from The Learning Lady is a great spot to gather inspiration for new math activities to bring into your classroom—and outdoors.

Chromebooks in the Math Classroom—This board includes ideas for using Chromebooks during math instruction and links to blog posts and infographics.