When you ask "What number is halfway between 68 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=68 and Y=87.
To find the number halfway between 68 and 87, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 87 into our formula, we get:
(68 + 87)/2 = 77.5
Thus, the number halfway between 68 and 87 is 77.5.
To check that our answer is correct, we subtract 68 from 77.5 and subtract 77.5 from 87 and compare the two numbers:
77.5 - 68 = 9.5
87 - 77.5 = 9.5
As you can see, the halfway number is 9.5 higher than 68 and 9.5 lower than 87. Therefore, our halfway between answer of 77.5 above is correct.
Halfway Between
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Halfway Between 68 and 88
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