When you ask "What number is halfway between 51 and 392?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=51 and Y=392.
To find the number halfway between 51 and 392, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 392 into our formula, we get:
(51 + 392)/2 = 221.5
Thus, the number halfway between 51 and 392 is 221.5.
To check that our answer is correct, we subtract 51 from 221.5 and subtract 221.5 from 392 and compare the two numbers:
221.5 - 51 = 170.5
392 - 221.5 = 170.5
As you can see, the halfway number is 170.5 higher than 51 and 170.5 lower than 392. Therefore, our halfway between answer of 221.5 above is correct.
Halfway Between
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Halfway Between 51 and 393
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