When you ask "What number is halfway between 99 and 710?" 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=710.
To find the number halfway between 99 and 710, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 710 into our formula, we get:
(99 + 710)/2 = 404.5
Thus, the number halfway between 99 and 710 is 404.5.
To check that our answer is correct, we subtract 99 from 404.5 and subtract 404.5 from 710 and compare the two numbers:
404.5 - 99 = 305.5
710 - 404.5 = 305.5
As you can see, the halfway number is 305.5 higher than 99 and 305.5 lower than 710. Therefore, our halfway between answer of 404.5 above is correct.
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