When you ask "What number is halfway between 72 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=72 and Y=420.
To find the number halfway between 72 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 420 into our formula, we get:
(72 + 420)/2 = 246
Thus, the number halfway between 72 and 420 is 246.
To check that our answer is correct, we subtract 72 from 246 and subtract 246 from 420 and compare the two numbers:
246 - 72 = 174
420 - 246 = 174
As you can see, the halfway number is 174 higher than 72 and 174 lower than 420. Therefore, our halfway between answer of 246 above is correct.
Halfway Between
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Halfway Between 72 and 421
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