When you ask "What number is halfway between 21 and 400?" 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=400.
To find the number halfway between 21 and 400, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 400 into our formula, we get:
(21 + 400)/2 = 210.5
Thus, the number halfway between 21 and 400 is 210.5.
To check that our answer is correct, we subtract 21 from 210.5 and subtract 210.5 from 400 and compare the two numbers:
210.5 - 21 = 189.5
400 - 210.5 = 189.5
As you can see, the halfway number is 189.5 higher than 21 and 189.5 lower than 400. Therefore, our halfway between answer of 210.5 above is correct.
Halfway Between
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Halfway Between 21 and 401
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