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These are critical thinking exercises. You're required to take a sentence equation and write it as a mathematical equation.

In most cases we use the sentence to tell us the operations. Here we have the word difference which tells us we're going to be subtracting. Ordering the numbers is the harder part. However, you should always start with a given number unless the problem was reversed (i.e. "How do you write the difference of a number k and 12")

So now we simply throw our computation together.

12 - k is the difference of 12 and a number k.

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13y ago

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Q: How do you write the difference of 12 and a number k?
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