When you ask "What number is halfway between 30 and 171?" 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=171.
To find the number halfway between 30 and 171, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 171 into our formula, we get:
(30 + 171)/2 = 100.5
Thus, the number halfway between 30 and 171 is 100.5.
To check that our answer is correct, we subtract 30 from 100.5 and subtract 100.5 from 171 and compare the two numbers:
100.5 - 30 = 70.5
171 - 100.5 = 70.5
As you can see, the halfway number is 70.5 higher than 30 and 70.5 lower than 171. Therefore, our halfway between answer of 100.5 above is correct.
Halfway Between
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Halfway Between 30 and 172
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