When you ask "What number is halfway between 18 and 136?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=136.
To find the number halfway between 18 and 136, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 136 into our formula, we get:
(18 + 136)/2 = 77
Thus, the number halfway between 18 and 136 is 77.
To check that our answer is correct, we subtract 18 from 77 and subtract 77 from 136 and compare the two numbers:
77 - 18 = 59
136 - 77 = 59
As you can see, the halfway number is 59 higher than 18 and 59 lower than 136. Therefore, our halfway between answer of 77 above is correct.
Halfway Between
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Halfway Between 18 and 137
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