Video: Subtracting Integers in a Real-World Context

A submarine was at a depth of 237 meters below sea level and then it rose up 70 meters. Calculate the new depth of the submarine.

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Video Transcript

A submarine was at a depth of 237 meters below sea level and then it rose up 70 meters. Calculate the new depth of the submarine.

So at the top, we have the sea level. And then it says the submarine was 237 meters below the sea level. But then, it rose up 70 meters. So now we’re closer to the sea level. We went up 70 meters. So to summarize, the submarine went down 237 meters but then rose 70 meters.

So let’s write these numbers as integers to find the new depth of the submarine. To go down 237 meters could be represented by negative 237. And then rising 70 meters, we’re going up 70 meters closer towards the sea level, would be adding a positive 70. So negative 237 plus 70 would give us negative 167. So this means the submarine would be 167 meters below sea level.

So to calculate the new depth of the submarine, we would say a depth of 167 meters.

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