When you ask "What number is halfway between 55 and 154?" 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=154.
To find the number halfway between 55 and 154, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 154 into our formula, we get:
(55 + 154)/2 = 104.5
Thus, the number halfway between 55 and 154 is 104.5.
To check that our answer is correct, we subtract 55 from 104.5 and subtract 104.5 from 154 and compare the two numbers:
104.5 - 55 = 49.5
154 - 104.5 = 49.5
As you can see, the halfway number is 49.5 higher than 55 and 49.5 lower than 154. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 55 and 155
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