When you ask "What number is halfway between 21 and 516?" 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=516.
To find the number halfway between 21 and 516, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 516 into our formula, we get:
(21 + 516)/2 = 268.5
Thus, the number halfway between 21 and 516 is 268.5.
To check that our answer is correct, we subtract 21 from 268.5 and subtract 268.5 from 516 and compare the two numbers:
268.5 - 21 = 247.5
516 - 268.5 = 247.5
As you can see, the halfway number is 247.5 higher than 21 and 247.5 lower than 516. Therefore, our halfway between answer of 268.5 above is correct.
Halfway Between
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Halfway Between 21 and 517
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