When you ask "What number is halfway between 64 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=64 and Y=643.
To find the number halfway between 64 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 643 into our formula, we get:
(64 + 643)/2 = 353.5
Thus, the number halfway between 64 and 643 is 353.5.
To check that our answer is correct, we subtract 64 from 353.5 and subtract 353.5 from 643 and compare the two numbers:
353.5 - 64 = 289.5
643 - 353.5 = 289.5
As you can see, the halfway number is 289.5 higher than 64 and 289.5 lower than 643. Therefore, our halfway between answer of 353.5 above is correct.
Halfway Between
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Halfway Between 64 and 644
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