When you ask "What number is halfway between 79 and 421?" 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=421.
To find the number halfway between 79 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 421 into our formula, we get:
(79 + 421)/2 = 250
Thus, the number halfway between 79 and 421 is 250.
To check that our answer is correct, we subtract 79 from 250 and subtract 250 from 421 and compare the two numbers:
250 - 79 = 171
421 - 250 = 171
As you can see, the halfway number is 171 higher than 79 and 171 lower than 421. Therefore, our halfway between answer of 250 above is correct.
Halfway Between
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Halfway Between 79 and 422
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