When you ask "What number is halfway between 99 and 221?" 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=221.
To find the number halfway between 99 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 221 into our formula, we get:
(99 + 221)/2 = 160
Thus, the number halfway between 99 and 221 is 160.
To check that our answer is correct, we subtract 99 from 160 and subtract 160 from 221 and compare the two numbers:
160 - 99 = 61
221 - 160 = 61
As you can see, the halfway number is 61 higher than 99 and 61 lower than 221. Therefore, our halfway between answer of 160 above is correct.
Halfway Between
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Halfway Between 99 and 222
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