When you ask "What number is halfway between 51 and 211?" 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=211.
To find the number halfway between 51 and 211, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 211 into our formula, we get:
(51 + 211)/2 = 131
Thus, the number halfway between 51 and 211 is 131.
To check that our answer is correct, we subtract 51 from 131 and subtract 131 from 211 and compare the two numbers:
131 - 51 = 80
211 - 131 = 80
As you can see, the halfway number is 80 higher than 51 and 80 lower than 211. Therefore, our halfway between answer of 131 above is correct.
Halfway Between
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Halfway Between 51 and 212
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