When you ask "What number is halfway between 5 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=5 and Y=155.
To find the number halfway between 5 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 155 into our formula, we get:
(5 + 155)/2 = 80
Thus, the number halfway between 5 and 155 is 80.
To check that our answer is correct, we subtract 5 from 80 and subtract 80 from 155 and compare the two numbers:
80 - 5 = 75
155 - 80 = 75
As you can see, the halfway number is 75 higher than 5 and 75 lower than 155. Therefore, our halfway between answer of 80 above is correct.
Halfway Between
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Halfway Between 5 and 156
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