When you ask "What number is halfway between 87 and 691?" 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=691.
To find the number halfway between 87 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 691 into our formula, we get:
(87 + 691)/2 = 389
Thus, the number halfway between 87 and 691 is 389.
To check that our answer is correct, we subtract 87 from 389 and subtract 389 from 691 and compare the two numbers:
389 - 87 = 302
691 - 389 = 302
As you can see, the halfway number is 302 higher than 87 and 302 lower than 691. Therefore, our halfway between answer of 389 above is correct.
Halfway Between
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Halfway Between 87 and 692
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