When you ask "What number is halfway between 18 and 147?" 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=147.
To find the number halfway between 18 and 147, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 147 into our formula, we get:
(18 + 147)/2 = 82.5
Thus, the number halfway between 18 and 147 is 82.5.
To check that our answer is correct, we subtract 18 from 82.5 and subtract 82.5 from 147 and compare the two numbers:
82.5 - 18 = 64.5
147 - 82.5 = 64.5
As you can see, the halfway number is 64.5 higher than 18 and 64.5 lower than 147. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 18 and 148
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