When you ask "What number is halfway between 21 and 257?" 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=257.
To find the number halfway between 21 and 257, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 257 into our formula, we get:
(21 + 257)/2 = 139
Thus, the number halfway between 21 and 257 is 139.
To check that our answer is correct, we subtract 21 from 139 and subtract 139 from 257 and compare the two numbers:
139 - 21 = 118
257 - 139 = 118
As you can see, the halfway number is 118 higher than 21 and 118 lower than 257. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 21 and 258
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