Adding and subtracting metrics will often use the same units. Add and subtract metrics with help from an experienced math professional in this free video clip.

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Adding and subtracting metrics will often use the same units. Add and subtract metrics with help from an experienced math professional in this free video clip.

Part of the Video Series: Solving Math Problems

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Hi, I'm Ryan Ault, I'm a physicist. And this is how to add and subtract metrics. When you're adding and subtracting metrics, they have to have the same units. For example, if I wanted to add two distances, we can say, L-one is equal to one meter and L-two is equal to 50 centimeters. We can find that the total distance is equal to L-one plus L-two. Which is equal to one meter plus 50 centimeters. Now, using the conversion ratios up here, we find that 50 centimeters is actually equal to one-half of a meter. So, find that D is equal to one meter plus zero point five meters equals one point five meters. Now, if we want to look at kilometers and meters, we can do something a little bit different with subtraction. We can say the difference is equal to L-four minus L-three. Now, four and three are just different from one and two to distinguish them. And we can say that L-four is equal to something like one kilometer and L-three could be something like 200 meters. Now again, we have to convert meters to kilometers or kilometers to meters. Either way would work. We could use one kilometer equals 1000 meters because that seems much easier to do. So, we find one kilometer, we put in 1000 meters, and we subtract 200 meters. And we find the difference is equal to 800 meters. I'm Ryan Ault, and this is how to add and subtract metrics.