When you ask "What number is halfway between 18 and 153?" 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=153.
To find the number halfway between 18 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 153 into our formula, we get:
(18 + 153)/2 = 85.5
Thus, the number halfway between 18 and 153 is 85.5.
To check that our answer is correct, we subtract 18 from 85.5 and subtract 85.5 from 153 and compare the two numbers:
85.5 - 18 = 67.5
153 - 85.5 = 67.5
As you can see, the halfway number is 67.5 higher than 18 and 67.5 lower than 153. Therefore, our halfway between answer of 85.5 above is correct.
Halfway Between
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Halfway Between 18 and 154
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