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Video: Subtracting Integers in a Real-World Context

Bethani Gasparine

The weather forecast was announced to be 10℃ in Cairo and −2℃ in London. Calculate the difference in temperatures between the two cities.

01:52

Video Transcript

The weather forecast was announced to be ten degrees in Cairo, and negative two degrees in London. Calculate the difference in temperatures between the cities.

Our keyword here is difference. In mathematics, difference means subtraction. So we will be subtracting ten and negative two. Again, to find the difference in these temperatures, we need to subtract ten and negative two. So ten minus negative two is how we will find the difference between these temperatures. Well two negatives when multiplied together, actually turn positive. So ten plus two means the difference in the temperature in Cairo to London, would be a twelve degree difference.

Let’s try to visualise this and take it a step further. If we would place these degrees on a number line, London would be at negative two and Cairo would be at positive ten. So when we say we wanna know the difference between these two temperatures, how far apart are they, how different are they, well we could count the spaces. And if we would count, it would result in twelve spaces. That’s because their temperature difference is twelve degrees. If you were in London at negative two and you added twelve degrees, you would be at the temperature that it is in Cairo, at ten degrees.

Therefore, as we said, the difference in temperatures between Cairo and London is twelve degrees.