When you ask "What number is halfway between 99 and 188?" 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=188.
To find the number halfway between 99 and 188, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 188 into our formula, we get:
(99 + 188)/2 = 143.5
Thus, the number halfway between 99 and 188 is 143.5.
To check that our answer is correct, we subtract 99 from 143.5 and subtract 143.5 from 188 and compare the two numbers:
143.5 - 99 = 44.5
188 - 143.5 = 44.5
As you can see, the halfway number is 44.5 higher than 99 and 44.5 lower than 188. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 99 and 189
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