When you ask "What number is halfway between 51 and 231?" 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=231.
To find the number halfway between 51 and 231, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 231 into our formula, we get:
(51 + 231)/2 = 141
Thus, the number halfway between 51 and 231 is 141.
To check that our answer is correct, we subtract 51 from 141 and subtract 141 from 231 and compare the two numbers:
141 - 51 = 90
231 - 141 = 90
As you can see, the halfway number is 90 higher than 51 and 90 lower than 231. Therefore, our halfway between answer of 141 above is correct.
Halfway Between
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Halfway Between 51 and 232
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