When you ask "What number is halfway between 71 and 318?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=71 and Y=318.
To find the number halfway between 71 and 318, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 318 into our formula, we get:
(71 + 318)/2 = 194.5
Thus, the number halfway between 71 and 318 is 194.5.
To check that our answer is correct, we subtract 71 from 194.5 and subtract 194.5 from 318 and compare the two numbers:
194.5 - 71 = 123.5
318 - 194.5 = 123.5
As you can see, the halfway number is 123.5 higher than 71 and 123.5 lower than 318. Therefore, our halfway between answer of 194.5 above is correct.
Halfway Between
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Halfway Between 71 and 319
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