Unit Rates (Grade 7) - Online Math Learning Common Core for Mathematics More Lessons for Grade 7. For example, if a person walks 1/2 mile in each 1/4 hour, compute the unit rate as the complex fraction 1/2/1/4 miles per hour, equivalently 2 miles per hour. Common Core: 7.RP.1. Suggested Learning Targets. I can compute unit rates of quantities associated with ratios of fractions (length, area, & other quantities).