When you ask "What number is halfway between 15 and 271?" 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=271.
To find the number halfway between 15 and 271, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 271 into our formula, we get:
(15 + 271)/2 = 143
Thus, the number halfway between 15 and 271 is 143.
To check that our answer is correct, we subtract 15 from 143 and subtract 143 from 271 and compare the two numbers:
143 - 15 = 128
271 - 143 = 128
As you can see, the halfway number is 128 higher than 15 and 128 lower than 271. Therefore, our halfway between answer of 143 above is correct.
Halfway Between
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Halfway Between 15 and 272
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