When you ask "What number is halfway between 18 and 178?" 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=178.
To find the number halfway between 18 and 178, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 178 into our formula, we get:
(18 + 178)/2 = 98
Thus, the number halfway between 18 and 178 is 98.
To check that our answer is correct, we subtract 18 from 98 and subtract 98 from 178 and compare the two numbers:
98 - 18 = 80
178 - 98 = 80
As you can see, the halfway number is 80 higher than 18 and 80 lower than 178. Therefore, our halfway between answer of 98 above is correct.
Halfway Between
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Halfway Between 18 and 179
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