When you ask "What number is halfway between 99 and 381?" 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=381.
To find the number halfway between 99 and 381, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 381 into our formula, we get:
(99 + 381)/2 = 240
Thus, the number halfway between 99 and 381 is 240.
To check that our answer is correct, we subtract 99 from 240 and subtract 240 from 381 and compare the two numbers:
240 - 99 = 141
381 - 240 = 141
As you can see, the halfway number is 141 higher than 99 and 141 lower than 381. Therefore, our halfway between answer of 240 above is correct.
Halfway Between
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Halfway Between 99 and 382
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