When you ask "What number is halfway between 18 and 100?" 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=100.
To find the number halfway between 18 and 100, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 100 into our formula, we get:
(18 + 100)/2 = 59
Thus, the number halfway between 18 and 100 is 59.
To check that our answer is correct, we subtract 18 from 59 and subtract 59 from 100 and compare the two numbers:
59 - 18 = 41
100 - 59 = 41
As you can see, the halfway number is 41 higher than 18 and 41 lower than 100. Therefore, our halfway between answer of 59 above is correct.
Halfway Between
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Halfway Between 18 and 101
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