When you ask "What number is halfway between 87 and 405?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=405.
To find the number halfway between 87 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 405 into our formula, we get:
(87 + 405)/2 = 246
Thus, the number halfway between 87 and 405 is 246.
To check that our answer is correct, we subtract 87 from 246 and subtract 246 from 405 and compare the two numbers:
246 - 87 = 159
405 - 246 = 159
As you can see, the halfway number is 159 higher than 87 and 159 lower than 405. Therefore, our halfway between answer of 246 above is correct.
Halfway Between
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Halfway Between 87 and 406
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