When you ask "What number is halfway between 78 and 423?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=423.
To find the number halfway between 78 and 423, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 423 into our formula, we get:
(78 + 423)/2 = 250.5
Thus, the number halfway between 78 and 423 is 250.5.
To check that our answer is correct, we subtract 78 from 250.5 and subtract 250.5 from 423 and compare the two numbers:
250.5 - 78 = 172.5
423 - 250.5 = 172.5
As you can see, the halfway number is 172.5 higher than 78 and 172.5 lower than 423. Therefore, our halfway between answer of 250.5 above is correct.
Halfway Between
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Halfway Between 78 and 424
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