When you ask "What number is halfway between 18 and 711?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=711.
To find the number halfway between 18 and 711, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 711 into our formula, we get:
(18 + 711)/2 = 364.5
Thus, the number halfway between 18 and 711 is 364.5.
To check that our answer is correct, we subtract 18 from 364.5 and subtract 364.5 from 711 and compare the two numbers:
364.5 - 18 = 346.5
711 - 364.5 = 346.5
As you can see, the halfway number is 346.5 higher than 18 and 346.5 lower than 711. Therefore, our halfway between answer of 364.5 above is correct.
Halfway Between
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Halfway Between 18 and 712
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