When you ask "What number is halfway between 18 and 222?" 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=222.
To find the number halfway between 18 and 222, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 222 into our formula, we get:
(18 + 222)/2 = 120
Thus, the number halfway between 18 and 222 is 120.
To check that our answer is correct, we subtract 18 from 120 and subtract 120 from 222 and compare the two numbers:
120 - 18 = 102
222 - 120 = 102
As you can see, the halfway number is 102 higher than 18 and 102 lower than 222. Therefore, our halfway between answer of 120 above is correct.
Halfway Between
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Halfway Between 18 and 223
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