When you ask "What number is halfway between 99 and 207?" 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=207.
To find the number halfway between 99 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 207 into our formula, we get:
(99 + 207)/2 = 153
Thus, the number halfway between 99 and 207 is 153.
To check that our answer is correct, we subtract 99 from 153 and subtract 153 from 207 and compare the two numbers:
153 - 99 = 54
207 - 153 = 54
As you can see, the halfway number is 54 higher than 99 and 54 lower than 207. Therefore, our halfway between answer of 153 above is correct.
Halfway Between
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Halfway Between 99 and 208
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