When you ask "What number is halfway between 30 and 269?" 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=269.
To find the number halfway between 30 and 269, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 269 into our formula, we get:
(30 + 269)/2 = 149.5
Thus, the number halfway between 30 and 269 is 149.5.
To check that our answer is correct, we subtract 30 from 149.5 and subtract 149.5 from 269 and compare the two numbers:
149.5 - 30 = 119.5
269 - 149.5 = 119.5
As you can see, the halfway number is 119.5 higher than 30 and 119.5 lower than 269. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 30 and 270
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