When you ask "What number is halfway between 99 and 651?" 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=651.
To find the number halfway between 99 and 651, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 651 into our formula, we get:
(99 + 651)/2 = 375
Thus, the number halfway between 99 and 651 is 375.
To check that our answer is correct, we subtract 99 from 375 and subtract 375 from 651 and compare the two numbers:
375 - 99 = 276
651 - 375 = 276
As you can see, the halfway number is 276 higher than 99 and 276 lower than 651. Therefore, our halfway between answer of 375 above is correct.
Halfway Between
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Halfway Between 99 and 652
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