When you ask "What number is halfway between 75 and 420?" 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=420.
To find the number halfway between 75 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 420 into our formula, we get:
(75 + 420)/2 = 247.5
Thus, the number halfway between 75 and 420 is 247.5.
To check that our answer is correct, we subtract 75 from 247.5 and subtract 247.5 from 420 and compare the two numbers:
247.5 - 75 = 172.5
420 - 247.5 = 172.5
As you can see, the halfway number is 172.5 higher than 75 and 172.5 lower than 420. Therefore, our halfway between answer of 247.5 above is correct.
Halfway Between
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Halfway Between 75 and 421
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