When you ask "What number is halfway between 18 and 149?" 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=149.
To find the number halfway between 18 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 149 into our formula, we get:
(18 + 149)/2 = 83.5
Thus, the number halfway between 18 and 149 is 83.5.
To check that our answer is correct, we subtract 18 from 83.5 and subtract 83.5 from 149 and compare the two numbers:
83.5 - 18 = 65.5
149 - 83.5 = 65.5
As you can see, the halfway number is 65.5 higher than 18 and 65.5 lower than 149. Therefore, our halfway between answer of 83.5 above is correct.
Halfway Between
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Halfway Between 18 and 150
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