When you ask "What number is halfway between 15 and 142?" 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=142.
To find the number halfway between 15 and 142, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 142 into our formula, we get:
(15 + 142)/2 = 78.5
Thus, the number halfway between 15 and 142 is 78.5.
To check that our answer is correct, we subtract 15 from 78.5 and subtract 78.5 from 142 and compare the two numbers:
78.5 - 15 = 63.5
142 - 78.5 = 63.5
As you can see, the halfway number is 63.5 higher than 15 and 63.5 lower than 142. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
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Halfway Between 15 and 143
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