When you ask "What number is halfway between 90 and 177?" 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=177.
To find the number halfway between 90 and 177, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 177 into our formula, we get:
(90 + 177)/2 = 133.5
Thus, the number halfway between 90 and 177 is 133.5.
To check that our answer is correct, we subtract 90 from 133.5 and subtract 133.5 from 177 and compare the two numbers:
133.5 - 90 = 43.5
177 - 133.5 = 43.5
As you can see, the halfway number is 43.5 higher than 90 and 43.5 lower than 177. Therefore, our halfway between answer of 133.5 above is correct.
Halfway Between
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Halfway Between 90 and 178
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