When you ask "What number is halfway between 21 and 224?" 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=224.
To find the number halfway between 21 and 224, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 224 into our formula, we get:
(21 + 224)/2 = 122.5
Thus, the number halfway between 21 and 224 is 122.5.
To check that our answer is correct, we subtract 21 from 122.5 and subtract 122.5 from 224 and compare the two numbers:
122.5 - 21 = 101.5
224 - 122.5 = 101.5
As you can see, the halfway number is 101.5 higher than 21 and 101.5 lower than 224. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 21 and 225
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