When you ask "What number is halfway between 99 and 131?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=131.
To find the number halfway between 99 and 131, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 131 into our formula, we get:
(99 + 131)/2 = 115
Thus, the number halfway between 99 and 131 is 115.
To check that our answer is correct, we subtract 99 from 115 and subtract 115 from 131 and compare the two numbers:
115 - 99 = 16
131 - 115 = 16
As you can see, the halfway number is 16 higher than 99 and 16 lower than 131. Therefore, our halfway between answer of 115 above is correct.
Halfway Between
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Halfway Between 99 and 132
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