When you ask "What number is halfway between 99 and 218?" 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=218.
To find the number halfway between 99 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 218 into our formula, we get:
(99 + 218)/2 = 158.5
Thus, the number halfway between 99 and 218 is 158.5.
To check that our answer is correct, we subtract 99 from 158.5 and subtract 158.5 from 218 and compare the two numbers:
158.5 - 99 = 59.5
218 - 158.5 = 59.5
As you can see, the halfway number is 59.5 higher than 99 and 59.5 lower than 218. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 99 and 219
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