When you ask "What number is halfway between 15 and 243?" 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=243.
To find the number halfway between 15 and 243, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 243 into our formula, we get:
(15 + 243)/2 = 129
Thus, the number halfway between 15 and 243 is 129.
To check that our answer is correct, we subtract 15 from 129 and subtract 129 from 243 and compare the two numbers:
129 - 15 = 114
243 - 129 = 114
As you can see, the halfway number is 114 higher than 15 and 114 lower than 243. Therefore, our halfway between answer of 129 above is correct.
Halfway Between
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Halfway Between 15 and 244
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