When you ask "What number is halfway between 79 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=79 and Y=620.
To find the number halfway between 79 and 620, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 620 into our formula, we get:
(79 + 620)/2 = 349.5
Thus, the number halfway between 79 and 620 is 349.5.
To check that our answer is correct, we subtract 79 from 349.5 and subtract 349.5 from 620 and compare the two numbers:
349.5 - 79 = 270.5
620 - 349.5 = 270.5
As you can see, the halfway number is 270.5 higher than 79 and 270.5 lower than 620. Therefore, our halfway between answer of 349.5 above is correct.
Halfway Between
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