When you ask "What number is halfway between 7 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=7 and Y=643.
To find the number halfway between 7 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 643 into our formula, we get:
(7 + 643)/2 = 325
Thus, the number halfway between 7 and 643 is 325.
To check that our answer is correct, we subtract 7 from 325 and subtract 325 from 643 and compare the two numbers:
325 - 7 = 318
643 - 325 = 318
As you can see, the halfway number is 318 higher than 7 and 318 lower than 643. Therefore, our halfway between answer of 325 above is correct.
Halfway Between
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Halfway Between 7 and 644
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