When you ask "What number is halfway between 51 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=51 and Y=688.
To find the number halfway between 51 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 688 into our formula, we get:
(51 + 688)/2 = 369.5
Thus, the number halfway between 51 and 688 is 369.5.
To check that our answer is correct, we subtract 51 from 369.5 and subtract 369.5 from 688 and compare the two numbers:
369.5 - 51 = 318.5
688 - 369.5 = 318.5
As you can see, the halfway number is 318.5 higher than 51 and 318.5 lower than 688. Therefore, our halfway between answer of 369.5 above is correct.
Halfway Between
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