When you ask "What number is halfway between 30 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=30 and Y=135.
To find the number halfway between 30 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 135 into our formula, we get:
(30 + 135)/2 = 82.5
Thus, the number halfway between 30 and 135 is 82.5.
To check that our answer is correct, we subtract 30 from 82.5 and subtract 82.5 from 135 and compare the two numbers:
82.5 - 30 = 52.5
135 - 82.5 = 52.5
As you can see, the halfway number is 52.5 higher than 30 and 52.5 lower than 135. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 30 and 136
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