When you ask "What number is halfway between 99 and 691?" 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=691.
To find the number halfway between 99 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 691 into our formula, we get:
(99 + 691)/2 = 395
Thus, the number halfway between 99 and 691 is 395.
To check that our answer is correct, we subtract 99 from 395 and subtract 395 from 691 and compare the two numbers:
395 - 99 = 296
691 - 395 = 296
As you can see, the halfway number is 296 higher than 99 and 296 lower than 691. Therefore, our halfway between answer of 395 above is correct.
Halfway Between
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Halfway Between 99 and 692
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