Fun 4 the Brain:  http://www.fun4thebrain.com/index.html

Math Playground:  https://www.mathplayground.com/

Mr. N: http://mrnussbaum.com/

That Quiz:  http://www.thatquiz.org/

Math is Fun:  http://www.mathsisfun.com/

Bar Graph maker:  https://www.meta-chart.com/bar#/your-charts

Math Dice:  https://www.random.org/dice/