When you ask "What number is halfway between 30 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=30 and Y=140.
To find the number halfway between 30 and 140, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 140 into our formula, we get:
(30 + 140)/2 = 85
Thus, the number halfway between 30 and 140 is 85.
To check that our answer is correct, we subtract 30 from 85 and subtract 85 from 140 and compare the two numbers:
85 - 30 = 55
140 - 85 = 55
As you can see, the halfway number is 55 higher than 30 and 55 lower than 140. Therefore, our halfway between answer of 85 above is correct.
Halfway Between
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Halfway Between 30 and 141
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