The idea is we can take these ratios or fractions and turn them into percentages by making the ratio or fraction out of 100. We would say that 42 feet out of a total of 121 feet of pipe is plastic.Īll right: we’ve added a few new things to our math library here, but you might be asking right about now, “Aren’t we dealing with percentages in this chapter? How does all this ratio and fraction stuff relate to percentages?” Ratios are similar to fractions, and each ratio can be written as a fraction. In this case, the 121 is derived from adding the plastic pipe and the steel pipe lengths together.Īt this point, you might be thinking that this looks and sounds familiar, and you would be correct. What is the ratio of plastic pipe to steel pipe that we need to install?Īnother question might be how much of the pipe is plastic in relation to how much total pipe we have. We have 42 feet of plastic pipe and 79 feet of steel pipe to install. Here is another example: let’s say we are on a job site, and we have to install some pipe. Regardless of which way we describe our pizza eating, what we are dealing with is the relationship between two numbers. In this case, 3 pieces of the pizza were eaten while 5 pieces were not. We could also write a ratio that identified how many pieces of the pizza were eaten and how many were not eaten. A ratio of 3:8 means that we have eaten 3 of the 8 pieces in the pizza. It has its own style, just like a fraction does. If we were to once again order a pizza and eat 3 of the 8 slices, we could look at that as a ratio. Mathematically speaking, a ratio is a relationship between two numbers. We should take a bit of time to talk about ratios and what they are. We already went through fractions in a past chapter, so we know what those are all about. Percentages, ratios, and fractions are all very similar and can be used to represent numbers in different ways, but with similar outcomes. What does a ratio have to do with percentage? What does a fraction have to do with percentage? What is a ratio? These are all good questions, and we’ll answer them here.
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