When you ask "What number is halfway between 99 and 670?" 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=670.
To find the number halfway between 99 and 670, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 670 into our formula, we get:
(99 + 670)/2 = 384.5
Thus, the number halfway between 99 and 670 is 384.5.
To check that our answer is correct, we subtract 99 from 384.5 and subtract 384.5 from 670 and compare the two numbers:
384.5 - 99 = 285.5
670 - 384.5 = 285.5
As you can see, the halfway number is 285.5 higher than 99 and 285.5 lower than 670. Therefore, our halfway between answer of 384.5 above is correct.
Halfway Between
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Halfway Between 99 and 671
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