When you ask "What number is halfway between 99 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=99 and Y=189.
To find the number halfway between 99 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 189 into our formula, we get:
(99 + 189)/2 = 144
Thus, the number halfway between 99 and 189 is 144.
To check that our answer is correct, we subtract 99 from 144 and subtract 144 from 189 and compare the two numbers:
144 - 99 = 45
189 - 144 = 45
As you can see, the halfway number is 45 higher than 99 and 45 lower than 189. Therefore, our halfway between answer of 144 above is correct.
Halfway Between
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Halfway Between 99 and 190
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