When you ask "What number is halfway between 51 and 420?" 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=420.
To find the number halfway between 51 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 420 into our formula, we get:
(51 + 420)/2 = 235.5
Thus, the number halfway between 51 and 420 is 235.5.
To check that our answer is correct, we subtract 51 from 235.5 and subtract 235.5 from 420 and compare the two numbers:
235.5 - 51 = 184.5
420 - 235.5 = 184.5
As you can see, the halfway number is 184.5 higher than 51 and 184.5 lower than 420. Therefore, our halfway between answer of 235.5 above is correct.
Halfway Between
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Halfway Between 51 and 421
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