Here is a great way to have your students investigate volume and discover the algorithm on their own. All you need is snap together cubes and this worksheet. Check out my blog post and see step by step how I use this worksheet.
I am a teacher, wife and mother. I have taught for over 20 years. I have taught pre-school, 9th grade, and pretty much every grade in between. For the past 11 years I have been lucky enough to be a 5th grade math focus teach who also gets to teach ELA. I started my blog http://quinnessentiallessons.blogspot.com/ back in 2013. I hope you will check it out.