When you ask "What number is halfway between 51 and 850?" 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=850.
To find the number halfway between 51 and 850, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 850 into our formula, we get:
(51 + 850)/2 = 450.5
Thus, the number halfway between 51 and 850 is 450.5.
To check that our answer is correct, we subtract 51 from 450.5 and subtract 450.5 from 850 and compare the two numbers:
450.5 - 51 = 399.5
850 - 450.5 = 399.5
As you can see, the halfway number is 399.5 higher than 51 and 399.5 lower than 850. Therefore, our halfway between answer of 450.5 above is correct.
Halfway Between
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Halfway Between 51 and 851
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