When you ask "What number is halfway between 99 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=99 and Y=643.
To find the number halfway between 99 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 643 into our formula, we get:
(99 + 643)/2 = 371
Thus, the number halfway between 99 and 643 is 371.
To check that our answer is correct, we subtract 99 from 371 and subtract 371 from 643 and compare the two numbers:
371 - 99 = 272
643 - 371 = 272
As you can see, the halfway number is 272 higher than 99 and 272 lower than 643. Therefore, our halfway between answer of 371 above is correct.
Halfway Between
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Halfway Between 99 and 644
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