I like this hands-on approach to maths; great for those outdoor learners ~ this link opens up to an article on Kindergarten Math but so many of the activities can be adapted to younger children, like the leaf activity pictured here.
I started off making a set of free task cards for upper elementary, but then I decided that the younger set should have some too, so now there is something for almost everyone! Not only that, both of these sets are correlated with Common Core Standards. For Grades 2-3 To complete these cards, your students will be measuring things around your classroom. Before they measure,