When you ask "What number is halfway between 55 and 143?" 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=143.
To find the number halfway between 55 and 143, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 143 into our formula, we get:
(55 + 143)/2 = 99
Thus, the number halfway between 55 and 143 is 99.
To check that our answer is correct, we subtract 55 from 99 and subtract 99 from 143 and compare the two numbers:
99 - 55 = 44
143 - 99 = 44
As you can see, the halfway number is 44 higher than 55 and 44 lower than 143. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 55 and 144
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