When you ask "What number is halfway between 21 and 450?" 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=450.
To find the number halfway between 21 and 450, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 450 into our formula, we get:
(21 + 450)/2 = 235.5
Thus, the number halfway between 21 and 450 is 235.5.
To check that our answer is correct, we subtract 21 from 235.5 and subtract 235.5 from 450 and compare the two numbers:
235.5 - 21 = 214.5
450 - 235.5 = 214.5
As you can see, the halfway number is 214.5 higher than 21 and 214.5 lower than 450. Therefore, our halfway between answer of 235.5 above is correct.
Halfway Between
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Halfway Between 21 and 451
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