When you ask "What number is halfway between 18 and 643?" 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=643.
To find the number halfway between 18 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 643 into our formula, we get:
(18 + 643)/2 = 330.5
Thus, the number halfway between 18 and 643 is 330.5.
To check that our answer is correct, we subtract 18 from 330.5 and subtract 330.5 from 643 and compare the two numbers:
330.5 - 18 = 312.5
643 - 330.5 = 312.5
As you can see, the halfway number is 312.5 higher than 18 and 312.5 lower than 643. Therefore, our halfway between answer of 330.5 above is correct.
Halfway Between
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Halfway Between 18 and 644
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