When you ask "What number is halfway between 68 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=68 and Y=151.
To find the number halfway between 68 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 151 into our formula, we get:
(68 + 151)/2 = 109.5
Thus, the number halfway between 68 and 151 is 109.5.
To check that our answer is correct, we subtract 68 from 109.5 and subtract 109.5 from 151 and compare the two numbers:
109.5 - 68 = 41.5
151 - 109.5 = 41.5
As you can see, the halfway number is 41.5 higher than 68 and 41.5 lower than 151. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 68 and 152
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