When you ask "What number is halfway between 75 and 686?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=75 and Y=686.
To find the number halfway between 75 and 686, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 686 into our formula, we get:
(75 + 686)/2 = 380.5
Thus, the number halfway between 75 and 686 is 380.5.
To check that our answer is correct, we subtract 75 from 380.5 and subtract 380.5 from 686 and compare the two numbers:
380.5 - 75 = 305.5
686 - 380.5 = 305.5
As you can see, the halfway number is 305.5 higher than 75 and 305.5 lower than 686. Therefore, our halfway between answer of 380.5 above is correct.
Halfway Between
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Halfway Between 75 and 687
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