When you ask "What number is halfway between 15 and 150?" 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=150.
To find the number halfway between 15 and 150, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 150 into our formula, we get:
(15 + 150)/2 = 82.5
Thus, the number halfway between 15 and 150 is 82.5.
To check that our answer is correct, we subtract 15 from 82.5 and subtract 82.5 from 150 and compare the two numbers:
82.5 - 15 = 67.5
150 - 82.5 = 67.5
As you can see, the halfway number is 67.5 higher than 15 and 67.5 lower than 150. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 15 and 151
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