When you ask "What number is halfway between 99 and 206?" 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=206.
To find the number halfway between 99 and 206, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 206 into our formula, we get:
(99 + 206)/2 = 152.5
Thus, the number halfway between 99 and 206 is 152.5.
To check that our answer is correct, we subtract 99 from 152.5 and subtract 152.5 from 206 and compare the two numbers:
152.5 - 99 = 53.5
206 - 152.5 = 53.5
As you can see, the halfway number is 53.5 higher than 99 and 53.5 lower than 206. Therefore, our halfway between answer of 152.5 above is correct.
Halfway Between
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Halfway Between 99 and 207
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