When you ask "What number is halfway between 91 and 99?" 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=99.
To find the number halfway between 91 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 99 into our formula, we get:
(91 + 99)/2 = 95
Thus, the number halfway between 91 and 99 is 95.
To check that our answer is correct, we subtract 91 from 95 and subtract 95 from 99 and compare the two numbers:
95 - 91 = 4
99 - 95 = 4
As you can see, the halfway number is 4 higher than 91 and 4 lower than 99. Therefore, our halfway between answer of 95 above is correct.
Halfway Between
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Halfway Between 91 and 100
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