When you ask "What number is halfway between 100 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=100 and Y=213.
To find the number halfway between 100 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 213 into our formula, we get:
(100 + 213)/2 = 156.5
Thus, the number halfway between 100 and 213 is 156.5.
To check that our answer is correct, we subtract 100 from 156.5 and subtract 156.5 from 213 and compare the two numbers:
156.5 - 100 = 56.5
213 - 156.5 = 56.5
As you can see, the halfway number is 56.5 higher than 100 and 56.5 lower than 213. Therefore, our halfway between answer of 156.5 above is correct.
Halfway Between
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Halfway Between 100 and 214
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