When you ask "What number is halfway between 91 and 221?" 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=221.
To find the number halfway between 91 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 221 into our formula, we get:
(91 + 221)/2 = 156
Thus, the number halfway between 91 and 221 is 156.
To check that our answer is correct, we subtract 91 from 156 and subtract 156 from 221 and compare the two numbers:
156 - 91 = 65
221 - 156 = 65
As you can see, the halfway number is 65 higher than 91 and 65 lower than 221. Therefore, our halfway between answer of 156 above is correct.
Halfway Between
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Halfway Between 91 and 222
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