When you ask "What number is halfway between 99 and 550?" 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=550.
To find the number halfway between 99 and 550, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 550 into our formula, we get:
(99 + 550)/2 = 324.5
Thus, the number halfway between 99 and 550 is 324.5.
To check that our answer is correct, we subtract 99 from 324.5 and subtract 324.5 from 550 and compare the two numbers:
324.5 - 99 = 225.5
550 - 324.5 = 225.5
As you can see, the halfway number is 225.5 higher than 99 and 225.5 lower than 550. Therefore, our halfway between answer of 324.5 above is correct.
Halfway Between
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Halfway Between 99 and 551
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