When you ask "What number is halfway between 18 and 273?" 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=273.
To find the number halfway between 18 and 273, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 273 into our formula, we get:
(18 + 273)/2 = 145.5
Thus, the number halfway between 18 and 273 is 145.5.
To check that our answer is correct, we subtract 18 from 145.5 and subtract 145.5 from 273 and compare the two numbers:
145.5 - 18 = 127.5
273 - 145.5 = 127.5
As you can see, the halfway number is 127.5 higher than 18 and 127.5 lower than 273. Therefore, our halfway between answer of 145.5 above is correct.
Halfway Between
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Halfway Between 18 and 274
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