Video #1 - What is a ratio?
http://www.virtualnerd.com/middle-math/ratios-proportions-percent/ratios-rates/ratio-definition
Video #2 - What are equivalent ratios?
http://www.virtualnerd.com/middle-math/ratios-proportions-percent/ratios-rates/equivalent-ratios-definition
Video #3 - How do you find equivalent ratios?
http://www.virtualnerd.com/middle-math/ratios-proportions-percent/ratios-rates/equivalent-ratios-example
Video #4 - How do you use a table to find equivalent ratios?
http://www.virtualnerd.com/middle-math/ratios-proportions-percent/ratios-rates/equivalent-ratios-table-example