When you ask "What number is halfway between 75 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=75 and Y=690.
To find the number halfway between 75 and 690, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 690 into our formula, we get:
(75 + 690)/2 = 382.5
Thus, the number halfway between 75 and 690 is 382.5.
To check that our answer is correct, we subtract 75 from 382.5 and subtract 382.5 from 690 and compare the two numbers:
382.5 - 75 = 307.5
690 - 382.5 = 307.5
As you can see, the halfway number is 307.5 higher than 75 and 307.5 lower than 690. Therefore, our halfway between answer of 382.5 above is correct.
Halfway Between
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Halfway Between 75 and 691
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