When you ask "What number is halfway between 9 and 101?" 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=101.
To find the number halfway between 9 and 101, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 101 into our formula, we get:
(9 + 101)/2 = 55
Thus, the number halfway between 9 and 101 is 55.
To check that our answer is correct, we subtract 9 from 55 and subtract 55 from 101 and compare the two numbers:
55 - 9 = 46
101 - 55 = 46
As you can see, the halfway number is 46 higher than 9 and 46 lower than 101. Therefore, our halfway between answer of 55 above is correct.
Halfway Between
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Halfway Between 9 and 102
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