When you ask "What number is halfway between 9 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=9 and Y=155.
To find the number halfway between 9 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 155 into our formula, we get:
(9 + 155)/2 = 82
Thus, the number halfway between 9 and 155 is 82.
To check that our answer is correct, we subtract 9 from 82 and subtract 82 from 155 and compare the two numbers:
82 - 9 = 73
155 - 82 = 73
As you can see, the halfway number is 73 higher than 9 and 73 lower than 155. Therefore, our halfway between answer of 82 above is correct.
Halfway Between
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Halfway Between 9 and 156
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