I love this Geometric Shapes chart shared by Kathryn on Kindergarten Kindergarten! I had to scroll down to find it, but found a ton of great ideas along the way. I also loved her shape museum. (She has lots of free ideas for teaching math concepts.

Di seguito alcuni materiali per imparare a risolvere le espressioni aritmetiche con i numeri interi: video-spiegazioni e due mappe concettuali con le princ

Math Routine--great for bell work to introduce a new number/concept for the day. Love this idea! The students would be familiar with the process, but it would be different everyday.

Subtraction Poem Anchor Chart Lots of grade math anchor charts A chart that could be hung in the classroom and a great visual aid to learning subtraction.

Solving Math Problems {Strategy Posters for Addition} Common Core