When you ask "What number is halfway between 51 and 72?" 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=72.
To find the number halfway between 51 and 72, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 72 into our formula, we get:
(51 + 72)/2 = 61.5
Thus, the number halfway between 51 and 72 is 61.5.
To check that our answer is correct, we subtract 51 from 61.5 and subtract 61.5 from 72 and compare the two numbers:
61.5 - 51 = 10.5
72 - 61.5 = 10.5
As you can see, the halfway number is 10.5 higher than 51 and 10.5 lower than 72. Therefore, our halfway between answer of 61.5 above is correct.
Halfway Between
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Halfway Between 51 and 73
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