When you ask "What number is halfway between 15 and 145?" 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=145.
To find the number halfway between 15 and 145, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 145 into our formula, we get:
(15 + 145)/2 = 80
Thus, the number halfway between 15 and 145 is 80.
To check that our answer is correct, we subtract 15 from 80 and subtract 80 from 145 and compare the two numbers:
80 - 15 = 65
145 - 80 = 65
As you can see, the halfway number is 65 higher than 15 and 65 lower than 145. Therefore, our halfway between answer of 80 above is correct.
Halfway Between
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Halfway Between 15 and 146
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