When you ask "What number is halfway between 4 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=4 and Y=135.
To find the number halfway between 4 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 135 into our formula, we get:
(4 + 135)/2 = 69.5
Thus, the number halfway between 4 and 135 is 69.5.
To check that our answer is correct, we subtract 4 from 69.5 and subtract 69.5 from 135 and compare the two numbers:
69.5 - 4 = 65.5
135 - 69.5 = 65.5
As you can see, the halfway number is 65.5 higher than 4 and 65.5 lower than 135. Therefore, our halfway between answer of 69.5 above is correct.
Halfway Between
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Halfway Between 4 and 136
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