When you ask "What number is halfway between 99 and 658?" 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=658.
To find the number halfway between 99 and 658, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 658 into our formula, we get:
(99 + 658)/2 = 378.5
Thus, the number halfway between 99 and 658 is 378.5.
To check that our answer is correct, we subtract 99 from 378.5 and subtract 378.5 from 658 and compare the two numbers:
378.5 - 99 = 279.5
658 - 378.5 = 279.5
As you can see, the halfway number is 279.5 higher than 99 and 279.5 lower than 658. Therefore, our halfway between answer of 378.5 above is correct.
Halfway Between
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Halfway Between 99 and 659
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