
When you ask "What number is halfway between 79 and 719?" 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=719.

To find the number halfway between 79 and 719, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 719 into our formula, we get:
(79 + 719)/2 = 399
Thus, the number halfway between 79 and 719 is 399.
To check that our answer is correct, we subtract 79 from 399 and subtract 399 from 719 and compare the two numbers:
399 - 79 = 320
719 - 399 = 320
As you can see, the halfway number is 320 higher than 79 and 320 lower than 719. Therefore, our halfway between answer of 399 above is correct.
Halfway Between
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