When you ask "What number is halfway between 99 and 150?" 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=150.
To find the number halfway between 99 and 150, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 150 into our formula, we get:
(99 + 150)/2 = 124.5
Thus, the number halfway between 99 and 150 is 124.5.
To check that our answer is correct, we subtract 99 from 124.5 and subtract 124.5 from 150 and compare the two numbers:
124.5 - 99 = 25.5
150 - 124.5 = 25.5
As you can see, the halfway number is 25.5 higher than 99 and 25.5 lower than 150. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 99 and 151
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