When you ask "What number is halfway between 90 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=90 and Y=213.
To find the number halfway between 90 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 213 into our formula, we get:
(90 + 213)/2 = 151.5
Thus, the number halfway between 90 and 213 is 151.5.
To check that our answer is correct, we subtract 90 from 151.5 and subtract 151.5 from 213 and compare the two numbers:
151.5 - 90 = 61.5
213 - 151.5 = 61.5
As you can see, the halfway number is 61.5 higher than 90 and 61.5 lower than 213. Therefore, our halfway between answer of 151.5 above is correct.
Halfway Between
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Halfway Between 90 and 214
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