When you ask "What number is halfway between 13 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=13 and Y=135.
To find the number halfway between 13 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 135 into our formula, we get:
(13 + 135)/2 = 74
Thus, the number halfway between 13 and 135 is 74.
To check that our answer is correct, we subtract 13 from 74 and subtract 74 from 135 and compare the two numbers:
74 - 13 = 61
135 - 74 = 61
As you can see, the halfway number is 61 higher than 13 and 61 lower than 135. Therefore, our halfway between answer of 74 above is correct.
Halfway Between
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Halfway Between 13 and 136
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