Here is a great resource of virtual manipulatives for math teachers  | Creative teaching and learning | Scoop.it
From www.educatorstechnology.com - August 24, 2018 1:26 AM

"The National Library of Virtual Manipulatives is a digital library that provides K-12 teachers and students with a wide variety of math activities and virtual manipulatives. These resources are arranged into five main categories: Number and Operations, Algebra, Geometry, Measurement, and Data Analysis and Probability ..."