When you ask "What number is halfway between 51 and 158?" 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=158.
To find the number halfway between 51 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 158 into our formula, we get:
(51 + 158)/2 = 104.5
Thus, the number halfway between 51 and 158 is 104.5.
To check that our answer is correct, we subtract 51 from 104.5 and subtract 104.5 from 158 and compare the two numbers:
104.5 - 51 = 53.5
158 - 104.5 = 53.5
As you can see, the halfway number is 53.5 higher than 51 and 53.5 lower than 158. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 51 and 159
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