Video: Interpreting the Change in a Quantity by Subtracting Integers

Express the change in temperature from 41°F to 23°F as an integer.

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Video Transcript

Express the change in temperature from 41 degrees Fahrenheit to 23 degrees Fahrenheit as an integer.

So we have two thermometers. Our first reading is 41 degrees Fahrenheit, and our second reading is 23 degrees Fahrenheit. We’ve moved from 41 to 23. The temperature is going down; the temperature is dropping, but by how much?

If we subtract 23 from 41, we get 18, so we know that the temperature has dropped 18 degrees. How can we express a drop of 18 degrees as an integer? The whole number is 18 — that’s part of the integer — but because it was a drop in temperature, we wanna represent that with a negative sign. We’re dealing with negative 18.

To express the change in temperature from 48 degrees Fahrenheit to 23 degrees Fahrenheit as an integer, we would write negative 18.

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