When you ask "What number is halfway between 25 and 510?" 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=510.
To find the number halfway between 25 and 510, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 510 into our formula, we get:
(25 + 510)/2 = 267.5
Thus, the number halfway between 25 and 510 is 267.5.
To check that our answer is correct, we subtract 25 from 267.5 and subtract 267.5 from 510 and compare the two numbers:
267.5 - 25 = 242.5
510 - 267.5 = 242.5
As you can see, the halfway number is 242.5 higher than 25 and 242.5 lower than 510. Therefore, our halfway between answer of 267.5 above is correct.
Halfway Between
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Halfway Between 25 and 511
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