When you ask "What number is halfway between 55 and 88?" 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=88.
To find the number halfway between 55 and 88, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 88 into our formula, we get:
(55 + 88)/2 = 71.5
Thus, the number halfway between 55 and 88 is 71.5.
To check that our answer is correct, we subtract 55 from 71.5 and subtract 71.5 from 88 and compare the two numbers:
71.5 - 55 = 16.5
88 - 71.5 = 16.5
As you can see, the halfway number is 16.5 higher than 55 and 16.5 lower than 88. Therefore, our halfway between answer of 71.5 above is correct.
Halfway Between
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