When you ask "What number is halfway between 30 and 249?" 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=249.
To find the number halfway between 30 and 249, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 249 into our formula, we get:
(30 + 249)/2 = 139.5
Thus, the number halfway between 30 and 249 is 139.5.
To check that our answer is correct, we subtract 30 from 139.5 and subtract 139.5 from 249 and compare the two numbers:
139.5 - 30 = 109.5
249 - 139.5 = 109.5
As you can see, the halfway number is 109.5 higher than 30 and 109.5 lower than 249. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 30 and 250
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