When you ask "What number is halfway between 66 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=66 and Y=135.
To find the number halfway between 66 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 135 into our formula, we get:
(66 + 135)/2 = 100.5
Thus, the number halfway between 66 and 135 is 100.5.
To check that our answer is correct, we subtract 66 from 100.5 and subtract 100.5 from 135 and compare the two numbers:
100.5 - 66 = 34.5
135 - 100.5 = 34.5
As you can see, the halfway number is 34.5 higher than 66 and 34.5 lower than 135. Therefore, our halfway between answer of 100.5 above is correct.
Halfway Between
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Halfway Between 66 and 136
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