When you ask "What number is halfway between 21 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=21 and Y=381.
To find the number halfway between 21 and 381, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 381 into our formula, we get:
(21 + 381)/2 = 201
Thus, the number halfway between 21 and 381 is 201.
To check that our answer is correct, we subtract 21 from 201 and subtract 201 from 381 and compare the two numbers:
201 - 21 = 180
381 - 201 = 180
As you can see, the halfway number is 180 higher than 21 and 180 lower than 381. Therefore, our halfway between answer of 201 above is correct.
Halfway Between
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Halfway Between 21 and 382
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