When you ask "What number is halfway between 15 and 242?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=242.
To find the number halfway between 15 and 242, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 242 into our formula, we get:
(15 + 242)/2 = 128.5
Thus, the number halfway between 15 and 242 is 128.5.
To check that our answer is correct, we subtract 15 from 128.5 and subtract 128.5 from 242 and compare the two numbers:
128.5 - 15 = 113.5
242 - 128.5 = 113.5
As you can see, the halfway number is 113.5 higher than 15 and 113.5 lower than 242. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 15 and 243
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