When you ask "What number is halfway between 73 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=73 and Y=690.
To find the number halfway between 73 and 690, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 73 and 690 into our formula, we get:
(73 + 690)/2 = 381.5
Thus, the number halfway between 73 and 690 is 381.5.
To check that our answer is correct, we subtract 73 from 381.5 and subtract 381.5 from 690 and compare the two numbers:
381.5 - 73 = 308.5
690 - 381.5 = 308.5
As you can see, the halfway number is 308.5 higher than 73 and 308.5 lower than 690. Therefore, our halfway between answer of 381.5 above is correct.
Halfway Between
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Halfway Between 73 and 691
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