When you ask "What number is halfway between 55 and 155?" 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=155.
To find the number halfway between 55 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 155 into our formula, we get:
(55 + 155)/2 = 105
Thus, the number halfway between 55 and 155 is 105.
To check that our answer is correct, we subtract 55 from 105 and subtract 105 from 155 and compare the two numbers:
105 - 55 = 50
155 - 105 = 50
As you can see, the halfway number is 50 higher than 55 and 50 lower than 155. Therefore, our halfway between answer of 105 above is correct.
Halfway Between
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Halfway Between 55 and 156
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