When you ask "What number is halfway between 55 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=55 and Y=231.
To find the number halfway between 55 and 231, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 231 into our formula, we get:
(55 + 231)/2 = 143
Thus, the number halfway between 55 and 231 is 143.
To check that our answer is correct, we subtract 55 from 143 and subtract 143 from 231 and compare the two numbers:
143 - 55 = 88
231 - 143 = 88
As you can see, the halfway number is 88 higher than 55 and 88 lower than 231. Therefore, our halfway between answer of 143 above is correct.
Halfway Between
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Halfway Between 55 and 232
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