When you ask "What number is halfway between 73 and 688?" 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=688.
To find the number halfway between 73 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 73 and 688 into our formula, we get:
(73 + 688)/2 = 380.5
Thus, the number halfway between 73 and 688 is 380.5.
To check that our answer is correct, we subtract 73 from 380.5 and subtract 380.5 from 688 and compare the two numbers:
380.5 - 73 = 307.5
688 - 380.5 = 307.5
As you can see, the halfway number is 307.5 higher than 73 and 307.5 lower than 688. Therefore, our halfway between answer of 380.5 above is correct.
Halfway Between
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