When you ask "What number is halfway between 21 and 378?" 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=378.
To find the number halfway between 21 and 378, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 378 into our formula, we get:
(21 + 378)/2 = 199.5
Thus, the number halfway between 21 and 378 is 199.5.
To check that our answer is correct, we subtract 21 from 199.5 and subtract 199.5 from 378 and compare the two numbers:
199.5 - 21 = 178.5
378 - 199.5 = 178.5
As you can see, the halfway number is 178.5 higher than 21 and 178.5 lower than 378. Therefore, our halfway between answer of 199.5 above is correct.
Halfway Between
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Halfway Between 21 and 379
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