When you ask "What number is halfway between 21 and 657?" 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=657.
To find the number halfway between 21 and 657, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 657 into our formula, we get:
(21 + 657)/2 = 339
Thus, the number halfway between 21 and 657 is 339.
To check that our answer is correct, we subtract 21 from 339 and subtract 339 from 657 and compare the two numbers:
339 - 21 = 318
657 - 339 = 318
As you can see, the halfway number is 318 higher than 21 and 318 lower than 657. Therefore, our halfway between answer of 339 above is correct.
Halfway Between
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Halfway Between 21 and 658
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