When you ask "What number is halfway between 25 and 840?" 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=840.
To find the number halfway between 25 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 840 into our formula, we get:
(25 + 840)/2 = 432.5
Thus, the number halfway between 25 and 840 is 432.5.
To check that our answer is correct, we subtract 25 from 432.5 and subtract 432.5 from 840 and compare the two numbers:
432.5 - 25 = 407.5
840 - 432.5 = 407.5
As you can see, the halfway number is 407.5 higher than 25 and 407.5 lower than 840. Therefore, our halfway between answer of 432.5 above is correct.
Halfway Between
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Halfway Between 25 and 841
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