When you ask "What number is halfway between 25 and 155?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=25 and Y=155.
To find the number halfway between 25 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 155 into our formula, we get:
(25 + 155)/2 = 90
Thus, the number halfway between 25 and 155 is 90.
To check that our answer is correct, we subtract 25 from 90 and subtract 90 from 155 and compare the two numbers:
90 - 25 = 65
155 - 90 = 65
As you can see, the halfway number is 65 higher than 25 and 65 lower than 155. Therefore, our halfway between answer of 90 above is correct.
Halfway Between
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Halfway Between 25 and 156
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