When you ask "What number is halfway between 90 and 93?" 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=93.
To find the number halfway between 90 and 93, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 93 into our formula, we get:
(90 + 93)/2 = 91.5
Thus, the number halfway between 90 and 93 is 91.5.
To check that our answer is correct, we subtract 90 from 91.5 and subtract 91.5 from 93 and compare the two numbers:
91.5 - 90 = 1.5
93 - 91.5 = 1.5
As you can see, the halfway number is 1.5 higher than 90 and 1.5 lower than 93. Therefore, our halfway between answer of 91.5 above is correct.
Halfway Between
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