When you ask "What number is halfway between 1 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=1 and Y=155.
To find the number halfway between 1 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 155 into our formula, we get:
(1 + 155)/2 = 78
Thus, the number halfway between 1 and 155 is 78.
To check that our answer is correct, we subtract 1 from 78 and subtract 78 from 155 and compare the two numbers:
78 - 1 = 77
155 - 78 = 77
As you can see, the halfway number is 77 higher than 1 and 77 lower than 155. Therefore, our halfway between answer of 78 above is correct.
Halfway Between
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Halfway Between 1 and 156
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