Key Terms from Grade 6 Ratios and Unite A roto is an ordered pair of numben which are not bom. Anato is de numbers the number is first, and the number second Two ratios AB and C D are equivalent ratio if there is a nonzero number C = A and Dec. For example, two ratios are equivalent if they both how A ratio relationship between two types of such as 5 miles per 2 quantity 2.5 miles/hour). The numerical part of the rate is called the unit rate and is simply the value in 1 hour the car travels 2.5 miles. The unit for the rate is miles/hour, read​