When you ask "What number is halfway between 79 and 420?" 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=420.
To find the number halfway between 79 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 420 into our formula, we get:
(79 + 420)/2 = 249.5
Thus, the number halfway between 79 and 420 is 249.5.
To check that our answer is correct, we subtract 79 from 249.5 and subtract 249.5 from 420 and compare the two numbers:
249.5 - 79 = 170.5
420 - 249.5 = 170.5
As you can see, the halfway number is 170.5 higher than 79 and 170.5 lower than 420. Therefore, our halfway between answer of 249.5 above is correct.
Halfway Between
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Halfway Between 79 and 421
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