When you ask "What number is halfway between 18 and 268?" 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=268.
To find the number halfway between 18 and 268, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 268 into our formula, we get:
(18 + 268)/2 = 143
Thus, the number halfway between 18 and 268 is 143.
To check that our answer is correct, we subtract 18 from 143 and subtract 143 from 268 and compare the two numbers:
143 - 18 = 125
268 - 143 = 125
As you can see, the halfway number is 125 higher than 18 and 125 lower than 268. Therefore, our halfway between answer of 143 above is correct.
Halfway Between
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Halfway Between 18 and 269
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