When you ask "What number is halfway between 75 and 644?" 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=644.
To find the number halfway between 75 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 644 into our formula, we get:
(75 + 644)/2 = 359.5
Thus, the number halfway between 75 and 644 is 359.5.
To check that our answer is correct, we subtract 75 from 359.5 and subtract 359.5 from 644 and compare the two numbers:
359.5 - 75 = 284.5
644 - 359.5 = 284.5
As you can see, the halfway number is 284.5 higher than 75 and 284.5 lower than 644. Therefore, our halfway between answer of 359.5 above is correct.
Halfway Between
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Halfway Between 75 and 645
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