When you ask "What number is halfway between 64 and 687?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=64 and Y=687.
To find the number halfway between 64 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 687 into our formula, we get:
(64 + 687)/2 = 375.5
Thus, the number halfway between 64 and 687 is 375.5.
To check that our answer is correct, we subtract 64 from 375.5 and subtract 375.5 from 687 and compare the two numbers:
375.5 - 64 = 311.5
687 - 375.5 = 311.5
As you can see, the halfway number is 311.5 higher than 64 and 311.5 lower than 687. Therefore, our halfway between answer of 375.5 above is correct.
Halfway Between
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Halfway Between 64 and 688
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