When you ask "What number is halfway between 21 and 513?" 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=513.
To find the number halfway between 21 and 513, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 513 into our formula, we get:
(21 + 513)/2 = 267
Thus, the number halfway between 21 and 513 is 267.
To check that our answer is correct, we subtract 21 from 267 and subtract 267 from 513 and compare the two numbers:
267 - 21 = 246
513 - 267 = 246
As you can see, the halfway number is 246 higher than 21 and 246 lower than 513. Therefore, our halfway between answer of 267 above is correct.
Halfway Between
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Halfway Between 21 and 514
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