When you ask "What number is halfway between 51 and 394?" 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=394.
To find the number halfway between 51 and 394, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 394 into our formula, we get:
(51 + 394)/2 = 222.5
Thus, the number halfway between 51 and 394 is 222.5.
To check that our answer is correct, we subtract 51 from 222.5 and subtract 222.5 from 394 and compare the two numbers:
222.5 - 51 = 171.5
394 - 222.5 = 171.5
As you can see, the halfway number is 171.5 higher than 51 and 171.5 lower than 394. Therefore, our halfway between answer of 222.5 above is correct.
Halfway Between
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Halfway Between 51 and 395
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