When you ask "What number is halfway between 18 and 502?" 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=502.
To find the number halfway between 18 and 502, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 502 into our formula, we get:
(18 + 502)/2 = 260
Thus, the number halfway between 18 and 502 is 260.
To check that our answer is correct, we subtract 18 from 260 and subtract 260 from 502 and compare the two numbers:
260 - 18 = 242
502 - 260 = 242
As you can see, the halfway number is 242 higher than 18 and 242 lower than 502. Therefore, our halfway between answer of 260 above is correct.
Halfway Between
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Halfway Between 18 and 503
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