When you ask "What number is halfway between 90 and 105?" 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=105.
To find the number halfway between 90 and 105, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 105 into our formula, we get:
(90 + 105)/2 = 97.5
Thus, the number halfway between 90 and 105 is 97.5.
To check that our answer is correct, we subtract 90 from 97.5 and subtract 97.5 from 105 and compare the two numbers:
97.5 - 90 = 7.5
105 - 97.5 = 7.5
As you can see, the halfway number is 7.5 higher than 90 and 7.5 lower than 105. Therefore, our halfway between answer of 97.5 above is correct.
Halfway Between
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Halfway Between 90 and 106
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