When you ask "What number is halfway between 99 and 158?" 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=158.
To find the number halfway between 99 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 158 into our formula, we get:
(99 + 158)/2 = 128.5
Thus, the number halfway between 99 and 158 is 128.5.
To check that our answer is correct, we subtract 99 from 128.5 and subtract 128.5 from 158 and compare the two numbers:
128.5 - 99 = 29.5
158 - 128.5 = 29.5
As you can see, the halfway number is 29.5 higher than 99 and 29.5 lower than 158. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 99 and 159
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