When you ask "What number is halfway between 21 and 714?" 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=714.
To find the number halfway between 21 and 714, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 714 into our formula, we get:
(21 + 714)/2 = 367.5
Thus, the number halfway between 21 and 714 is 367.5.
To check that our answer is correct, we subtract 21 from 367.5 and subtract 367.5 from 714 and compare the two numbers:
367.5 - 21 = 346.5
714 - 367.5 = 346.5
As you can see, the halfway number is 346.5 higher than 21 and 346.5 lower than 714. Therefore, our halfway between answer of 367.5 above is correct.
Halfway Between
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Halfway Between 21 and 715
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