When you ask "What number is halfway between 11 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=11 and Y=840.
To find the number halfway between 11 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 840 into our formula, we get:
(11 + 840)/2 = 425.5
Thus, the number halfway between 11 and 840 is 425.5.
To check that our answer is correct, we subtract 11 from 425.5 and subtract 425.5 from 840 and compare the two numbers:
425.5 - 11 = 414.5
840 - 425.5 = 414.5
As you can see, the halfway number is 414.5 higher than 11 and 414.5 lower than 840. Therefore, our halfway between answer of 425.5 above is correct.
Halfway Between
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Halfway Between 11 and 841
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