When you ask "What number is halfway between 91 and 320?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=91 and Y=320.
To find the number halfway between 91 and 320, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 320 into our formula, we get:
(91 + 320)/2 = 205.5
Thus, the number halfway between 91 and 320 is 205.5.
To check that our answer is correct, we subtract 91 from 205.5 and subtract 205.5 from 320 and compare the two numbers:
205.5 - 91 = 114.5
320 - 205.5 = 114.5
As you can see, the halfway number is 114.5 higher than 91 and 114.5 lower than 320. Therefore, our halfway between answer of 205.5 above is correct.
Halfway Between
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Halfway Between 91 and 321
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