When you ask "What number is halfway between 12 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=12 and Y=135.
To find the number halfway between 12 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 135 into our formula, we get:
(12 + 135)/2 = 73.5
Thus, the number halfway between 12 and 135 is 73.5.
To check that our answer is correct, we subtract 12 from 73.5 and subtract 73.5 from 135 and compare the two numbers:
73.5 - 12 = 61.5
135 - 73.5 = 61.5
As you can see, the halfway number is 61.5 higher than 12 and 61.5 lower than 135. Therefore, our halfway between answer of 73.5 above is correct.
Halfway Between
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Halfway Between 12 and 136
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