When you ask "What number is halfway between 87 and 213?" 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=213.
To find the number halfway between 87 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 213 into our formula, we get:
(87 + 213)/2 = 150
Thus, the number halfway between 87 and 213 is 150.
To check that our answer is correct, we subtract 87 from 150 and subtract 150 from 213 and compare the two numbers:
150 - 87 = 63
213 - 150 = 63
As you can see, the halfway number is 63 higher than 87 and 63 lower than 213. Therefore, our halfway between answer of 150 above is correct.
Halfway Between
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Halfway Between 87 and 214
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