When you ask "What number is halfway between 90 and 291?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=291.
To find the number halfway between 90 and 291, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 291 into our formula, we get:
(90 + 291)/2 = 190.5
Thus, the number halfway between 90 and 291 is 190.5.
To check that our answer is correct, we subtract 90 from 190.5 and subtract 190.5 from 291 and compare the two numbers:
190.5 - 90 = 100.5
291 - 190.5 = 100.5
As you can see, the halfway number is 100.5 higher than 90 and 100.5 lower than 291. Therefore, our halfway between answer of 190.5 above is correct.
Halfway Between
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Halfway Between 90 and 292
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