When you ask "What number is halfway between 99 and 291?" 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=291.
To find the number halfway between 99 and 291, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 291 into our formula, we get:
(99 + 291)/2 = 195
Thus, the number halfway between 99 and 291 is 195.
To check that our answer is correct, we subtract 99 from 195 and subtract 195 from 291 and compare the two numbers:
195 - 99 = 96
291 - 195 = 96
As you can see, the halfway number is 96 higher than 99 and 96 lower than 291. Therefore, our halfway between answer of 195 above is correct.
Halfway Between
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Halfway Between 99 and 292
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