When you ask "What number is halfway between 51 and 87?" 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=87.
To find the number halfway between 51 and 87, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 87 into our formula, we get:
(51 + 87)/2 = 69
Thus, the number halfway between 51 and 87 is 69.
To check that our answer is correct, we subtract 51 from 69 and subtract 69 from 87 and compare the two numbers:
69 - 51 = 18
87 - 69 = 18
As you can see, the halfway number is 18 higher than 51 and 18 lower than 87. Therefore, our halfway between answer of 69 above is correct.
Halfway Between
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Halfway Between 51 and 88
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