This is a great simple video either can be watched by educator, or by students or as a review to help students walk through the steps. It walks through one problem as a model then has one for students to try and solve. In total there is 4 problems done- takes about 4 minutes but you can pause,explain, try anything you see.
Great teaching tool or refresher!!
In addition in my store there is other slide shows and practice sheets to accompany this.