When you ask "What number is halfway between 21 and 245?" 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=245.
To find the number halfway between 21 and 245, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 245 into our formula, we get:
(21 + 245)/2 = 133
Thus, the number halfway between 21 and 245 is 133.
To check that our answer is correct, we subtract 21 from 133 and subtract 133 from 245 and compare the two numbers:
133 - 21 = 112
245 - 133 = 112
As you can see, the halfway number is 112 higher than 21 and 112 lower than 245. Therefore, our halfway between answer of 133 above is correct.
Halfway Between
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Halfway Between 21 and 246
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