When you ask "What number is halfway between 10 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=10 and Y=643.
To find the number halfway between 10 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 643 into our formula, we get:
(10 + 643)/2 = 326.5
Thus, the number halfway between 10 and 643 is 326.5.
To check that our answer is correct, we subtract 10 from 326.5 and subtract 326.5 from 643 and compare the two numbers:
326.5 - 10 = 316.5
643 - 326.5 = 316.5
As you can see, the halfway number is 316.5 higher than 10 and 316.5 lower than 643. Therefore, our halfway between answer of 326.5 above is correct.
Halfway Between
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Halfway Between 10 and 644
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