When you ask "What number is halfway between 21 and 225?" 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=225.
To find the number halfway between 21 and 225, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 225 into our formula, we get:
(21 + 225)/2 = 123
Thus, the number halfway between 21 and 225 is 123.
To check that our answer is correct, we subtract 21 from 123 and subtract 123 from 225 and compare the two numbers:
123 - 21 = 102
225 - 123 = 102
As you can see, the halfway number is 102 higher than 21 and 102 lower than 225. Therefore, our halfway between answer of 123 above is correct.
Halfway Between
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Halfway Between 21 and 226
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