When you ask "What number is halfway between 99 and 628?" 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=628.
To find the number halfway between 99 and 628, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 628 into our formula, we get:
(99 + 628)/2 = 363.5
Thus, the number halfway between 99 and 628 is 363.5.
To check that our answer is correct, we subtract 99 from 363.5 and subtract 363.5 from 628 and compare the two numbers:
363.5 - 99 = 264.5
628 - 363.5 = 264.5
As you can see, the halfway number is 264.5 higher than 99 and 264.5 lower than 628. Therefore, our halfway between answer of 363.5 above is correct.
Halfway Between
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Halfway Between 99 and 629
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