When you ask "What number is halfway between 51 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=51 and Y=151.
To find the number halfway between 51 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 151 into our formula, we get:
(51 + 151)/2 = 101
Thus, the number halfway between 51 and 151 is 101.
To check that our answer is correct, we subtract 51 from 101 and subtract 101 from 151 and compare the two numbers:
101 - 51 = 50
151 - 101 = 50
As you can see, the halfway number is 50 higher than 51 and 50 lower than 151. Therefore, our halfway between answer of 101 above is correct.
Halfway Between
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Halfway Between 51 and 152
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