EMBARC.Online

 https://technology.cpm.org/general/tiles/

   https://www.didax.com/math/virtual-manipulatives.html

You don't need to buy DreamBox to use their virtual manipulatives. These virtual manipulatives can be used in large- or small-group instructional settings with your interactive white board or projector, or on computers.

http://www.dreambox.com/teachertools?q=/teachertools-quick-images

https://ggbm.at/NPDu3rCm

GeoGebra is a wonderful tool. Create your own interactive applet or use one of the thousands that have already been made.

Made with Google slides. Students can collaboratively work in the same slide.

 https://docs.google.com/presentation/d/1P8RqQi7VCIqJO_Ssia8khcOp5sb-KXeVTa2uUV670_A/copy

https://www.mathlearningcenter.org/apps

http://www.mathplayground.com/

This website has it all: number games, flash cards, virtual math manipulatives, The best part of this site are...

• Thinking Blocks: learn how to solve problems using the Singapore bar model. 
• Common Core Math: activities specifically aligned to the CCSS.

https://mathigon.org/polypad

 An incredibly versatile virtual manipulative that is easy to use. 

https://mathsbot.com/#Manipulatives

https://toytheater.com/category/teacher-tools/

A list of virtual manipulatives: web-based apps or apps for the iPad. Or BOTH!

https://docs.google.com/document/d/19dza0lsL-3PSJX0_NdMlBl4jvLnAyw90bY0qmCO9PF0/pub

http://illuminations.nctm.org/Activity.aspx?id=3565

Show this ten-frame on your projector to lead a whole-class discussion.