When you ask "What number is halfway between 18 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=18 and Y=691.
To find the number halfway between 18 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 691 into our formula, we get:
(18 + 691)/2 = 354.5
Thus, the number halfway between 18 and 691 is 354.5.
To check that our answer is correct, we subtract 18 from 354.5 and subtract 354.5 from 691 and compare the two numbers:
354.5 - 18 = 336.5
691 - 354.5 = 336.5
As you can see, the halfway number is 336.5 higher than 18 and 336.5 lower than 691. Therefore, our halfway between answer of 354.5 above is correct.
Halfway Between
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Halfway Between 18 and 692
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