When you ask "What number is halfway between 99 and 648?" 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=648.
To find the number halfway between 99 and 648, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 648 into our formula, we get:
(99 + 648)/2 = 373.5
Thus, the number halfway between 99 and 648 is 373.5.
To check that our answer is correct, we subtract 99 from 373.5 and subtract 373.5 from 648 and compare the two numbers:
373.5 - 99 = 274.5
648 - 373.5 = 274.5
As you can see, the halfway number is 274.5 higher than 99 and 274.5 lower than 648. Therefore, our halfway between answer of 373.5 above is correct.
Halfway Between
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Halfway Between 99 and 649
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