When you ask "What number is halfway between 9 and 135?" 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=135.
To find the number halfway between 9 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 135 into our formula, we get:
(9 + 135)/2 = 72
Thus, the number halfway between 9 and 135 is 72.
To check that our answer is correct, we subtract 9 from 72 and subtract 72 from 135 and compare the two numbers:
72 - 9 = 63
135 - 72 = 63
As you can see, the halfway number is 63 higher than 9 and 63 lower than 135. Therefore, our halfway between answer of 72 above is correct.
Halfway Between
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Halfway Between 9 and 136
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