When you ask "What number is halfway between 99 and 212?" 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=212.
To find the number halfway between 99 and 212, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 212 into our formula, we get:
(99 + 212)/2 = 155.5
Thus, the number halfway between 99 and 212 is 155.5.
To check that our answer is correct, we subtract 99 from 155.5 and subtract 155.5 from 212 and compare the two numbers:
155.5 - 99 = 56.5
212 - 155.5 = 56.5
As you can see, the halfway number is 56.5 higher than 99 and 56.5 lower than 212. Therefore, our halfway between answer of 155.5 above is correct.
Halfway Between
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Halfway Between 99 and 213
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