When you ask "What number is halfway between 25 and 289?" 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=289.
To find the number halfway between 25 and 289, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 289 into our formula, we get:
(25 + 289)/2 = 157
Thus, the number halfway between 25 and 289 is 157.
To check that our answer is correct, we subtract 25 from 157 and subtract 157 from 289 and compare the two numbers:
157 - 25 = 132
289 - 157 = 132
As you can see, the halfway number is 132 higher than 25 and 132 lower than 289. Therefore, our halfway between answer of 157 above is correct.
Halfway Between
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Halfway Between 25 and 290
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