When you ask "What number is halfway between 18 and 260?" 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=260.
To find the number halfway between 18 and 260, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 260 into our formula, we get:
(18 + 260)/2 = 139
Thus, the number halfway between 18 and 260 is 139.
To check that our answer is correct, we subtract 18 from 139 and subtract 139 from 260 and compare the two numbers:
139 - 18 = 121
260 - 139 = 121
As you can see, the halfway number is 121 higher than 18 and 121 lower than 260. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 18 and 261
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