When you ask "What number is halfway between 21 and 514?" 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=514.
To find the number halfway between 21 and 514, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 514 into our formula, we get:
(21 + 514)/2 = 267.5
Thus, the number halfway between 21 and 514 is 267.5.
To check that our answer is correct, we subtract 21 from 267.5 and subtract 267.5 from 514 and compare the two numbers:
267.5 - 21 = 246.5
514 - 267.5 = 246.5
As you can see, the halfway number is 246.5 higher than 21 and 246.5 lower than 514. Therefore, our halfway between answer of 267.5 above is correct.
Halfway Between
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Halfway Between 21 and 515
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