When you ask "What number is halfway between 30 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=30 and Y=691.
To find the number halfway between 30 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 691 into our formula, we get:
(30 + 691)/2 = 360.5
Thus, the number halfway between 30 and 691 is 360.5.
To check that our answer is correct, we subtract 30 from 360.5 and subtract 360.5 from 691 and compare the two numbers:
360.5 - 30 = 330.5
691 - 360.5 = 330.5
As you can see, the halfway number is 330.5 higher than 30 and 330.5 lower than 691. Therefore, our halfway between answer of 360.5 above is correct.
Halfway Between
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Halfway Between 30 and 692
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