When you ask "What number is halfway between 99 and 140?" 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=140.
To find the number halfway between 99 and 140, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 140 into our formula, we get:
(99 + 140)/2 = 119.5
Thus, the number halfway between 99 and 140 is 119.5.
To check that our answer is correct, we subtract 99 from 119.5 and subtract 119.5 from 140 and compare the two numbers:
119.5 - 99 = 20.5
140 - 119.5 = 20.5
As you can see, the halfway number is 20.5 higher than 99 and 20.5 lower than 140. Therefore, our halfway between answer of 119.5 above is correct.
Halfway Between
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Halfway Between 99 and 141
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