When you ask "What number is halfway between 87 and 550?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=550.
To find the number halfway between 87 and 550, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 550 into our formula, we get:
(87 + 550)/2 = 318.5
Thus, the number halfway between 87 and 550 is 318.5.
To check that our answer is correct, we subtract 87 from 318.5 and subtract 318.5 from 550 and compare the two numbers:
318.5 - 87 = 231.5
550 - 318.5 = 231.5
As you can see, the halfway number is 231.5 higher than 87 and 231.5 lower than 550. Therefore, our halfway between answer of 318.5 above is correct.
Halfway Between
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Halfway Between 87 and 551
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