When you ask "What number is halfway between 79 and 690?" 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=690.
To find the number halfway between 79 and 690, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 690 into our formula, we get:
(79 + 690)/2 = 384.5
Thus, the number halfway between 79 and 690 is 384.5.
To check that our answer is correct, we subtract 79 from 384.5 and subtract 384.5 from 690 and compare the two numbers:
384.5 - 79 = 305.5
690 - 384.5 = 305.5
As you can see, the halfway number is 305.5 higher than 79 and 305.5 lower than 690. Therefore, our halfway between answer of 384.5 above is correct.
Halfway Between
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Halfway Between 79 and 691
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