When you ask "What number is halfway between 91 and 520?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=91 and Y=520.
To find the number halfway between 91 and 520, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 520 into our formula, we get:
(91 + 520)/2 = 305.5
Thus, the number halfway between 91 and 520 is 305.5.
To check that our answer is correct, we subtract 91 from 305.5 and subtract 305.5 from 520 and compare the two numbers:
305.5 - 91 = 214.5
520 - 305.5 = 214.5
As you can see, the halfway number is 214.5 higher than 91 and 214.5 lower than 520. Therefore, our halfway between answer of 305.5 above is correct.
Halfway Between
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Halfway Between 91 and 521
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