When you ask "What number is halfway between 72 and 321?" 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=321.
To find the number halfway between 72 and 321, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 321 into our formula, we get:
(72 + 321)/2 = 196.5
Thus, the number halfway between 72 and 321 is 196.5.
To check that our answer is correct, we subtract 72 from 196.5 and subtract 196.5 from 321 and compare the two numbers:
196.5 - 72 = 124.5
321 - 196.5 = 124.5
As you can see, the halfway number is 124.5 higher than 72 and 124.5 lower than 321. Therefore, our halfway between answer of 196.5 above is correct.
Halfway Between
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Halfway Between 72 and 322
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