When you ask "What number is halfway between 15 and 151?" 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=151.
To find the number halfway between 15 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 151 into our formula, we get:
(15 + 151)/2 = 83
Thus, the number halfway between 15 and 151 is 83.
To check that our answer is correct, we subtract 15 from 83 and subtract 83 from 151 and compare the two numbers:
83 - 15 = 68
151 - 83 = 68
As you can see, the halfway number is 68 higher than 15 and 68 lower than 151. Therefore, our halfway between answer of 83 above is correct.
Halfway Between
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Halfway Between 15 and 152
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