When you ask "What number is halfway between 18 and 158?" 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=158.
To find the number halfway between 18 and 158, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 158 into our formula, we get:
(18 + 158)/2 = 88
Thus, the number halfway between 18 and 158 is 88.
To check that our answer is correct, we subtract 18 from 88 and subtract 88 from 158 and compare the two numbers:
88 - 18 = 70
158 - 88 = 70
As you can see, the halfway number is 70 higher than 18 and 70 lower than 158. Therefore, our halfway between answer of 88 above is correct.
Halfway Between
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Halfway Between 18 and 159
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