When you ask "What number is halfway between 90 and 189?" 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=189.
To find the number halfway between 90 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 189 into our formula, we get:
(90 + 189)/2 = 139.5
Thus, the number halfway between 90 and 189 is 139.5.
To check that our answer is correct, we subtract 90 from 139.5 and subtract 139.5 from 189 and compare the two numbers:
139.5 - 90 = 49.5
189 - 139.5 = 49.5
As you can see, the halfway number is 49.5 higher than 90 and 49.5 lower than 189. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 90 and 190
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