When you ask "What number is halfway between 51 and 400?" 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=400.
To find the number halfway between 51 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 400 into our formula, we get:
(51 + 400)/2 = 225.5
Thus, the number halfway between 51 and 400 is 225.5.
To check that our answer is correct, we subtract 51 from 225.5 and subtract 225.5 from 400 and compare the two numbers:
225.5 - 51 = 174.5
400 - 225.5 = 174.5
As you can see, the halfway number is 174.5 higher than 51 and 174.5 lower than 400. Therefore, our halfway between answer of 225.5 above is correct.
Halfway Between
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Halfway Between 51 and 401
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