When you ask "What number is halfway between 63 and 390?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=63 and Y=390.
To find the number halfway between 63 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 63 and 390 into our formula, we get:
(63 + 390)/2 = 226.5
Thus, the number halfway between 63 and 390 is 226.5.
To check that our answer is correct, we subtract 63 from 226.5 and subtract 226.5 from 390 and compare the two numbers:
226.5 - 63 = 163.5
390 - 226.5 = 163.5
As you can see, the halfway number is 163.5 higher than 63 and 163.5 lower than 390. Therefore, our halfway between answer of 226.5 above is correct.
Halfway Between
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Halfway Between 63 and 391
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