Have fun balancing! ⚖️💕  http://solveme.edc.org/

Click Lesson: area and perimeter http://www.learnalberta.ca/content/me5l/html/math5.html

Do you like patterns?  Who wants to try to figure out how many in the next steps?  Can you find the rule?
http://www.visualpatterns.org/
"homework help" ... the fractions on a numberline might be helpful: http://elemmath.jordandistrict.org/homework-help-third/

Pi 
Watch this video of Pi circumference being unrolled: https://upload.wikimedia.org/wikipedia/commons/2/2a/Pi-unrolled-720.gif
http://visual.ly/visualizing-pi