When you ask "What number is halfway between 51 and 456?" 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=456.
To find the number halfway between 51 and 456, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 456 into our formula, we get:
(51 + 456)/2 = 253.5
Thus, the number halfway between 51 and 456 is 253.5.
To check that our answer is correct, we subtract 51 from 253.5 and subtract 253.5 from 456 and compare the two numbers:
253.5 - 51 = 202.5
456 - 253.5 = 202.5
As you can see, the halfway number is 202.5 higher than 51 and 202.5 lower than 456. Therefore, our halfway between answer of 253.5 above is correct.
Halfway Between
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Halfway Between 51 and 457
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