When you ask "What number is halfway between 99 and 620?" 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=620.
To find the number halfway between 99 and 620, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 620 into our formula, we get:
(99 + 620)/2 = 359.5
Thus, the number halfway between 99 and 620 is 359.5.
To check that our answer is correct, we subtract 99 from 359.5 and subtract 359.5 from 620 and compare the two numbers:
359.5 - 99 = 260.5
620 - 359.5 = 260.5
As you can see, the halfway number is 260.5 higher than 99 and 260.5 lower than 620. Therefore, our halfway between answer of 359.5 above is correct.
Halfway Between
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