When you ask "What number is halfway between 49 and 90?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=49 and Y=90.
To find the number halfway between 49 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 49 and 90 into our formula, we get:
(49 + 90)/2 = 69.5
Thus, the number halfway between 49 and 90 is 69.5.
To check that our answer is correct, we subtract 49 from 69.5 and subtract 69.5 from 90 and compare the two numbers:
69.5 - 49 = 20.5
90 - 69.5 = 20.5
As you can see, the halfway number is 20.5 higher than 49 and 20.5 lower than 90. Therefore, our halfway between answer of 69.5 above is correct.
Halfway Between
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Halfway Between 49 and 91
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