When you ask "What number is halfway between 99 and 128?" 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=128.
To find the number halfway between 99 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 128 into our formula, we get:
(99 + 128)/2 = 113.5
Thus, the number halfway between 99 and 128 is 113.5.
To check that our answer is correct, we subtract 99 from 113.5 and subtract 113.5 from 128 and compare the two numbers:
113.5 - 99 = 14.5
128 - 113.5 = 14.5
As you can see, the halfway number is 14.5 higher than 99 and 14.5 lower than 128. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 99 and 129
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