When you ask "What number is halfway between 9 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=9 and Y=151.
To find the number halfway between 9 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 151 into our formula, we get:
(9 + 151)/2 = 80
Thus, the number halfway between 9 and 151 is 80.
To check that our answer is correct, we subtract 9 from 80 and subtract 80 from 151 and compare the two numbers:
80 - 9 = 71
151 - 80 = 71
As you can see, the halfway number is 71 higher than 9 and 71 lower than 151. Therefore, our halfway between answer of 80 above is correct.
Halfway Between
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Halfway Between 9 and 152
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