When you ask "What number is halfway between 21 and 228?" 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=228.
To find the number halfway between 21 and 228, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 228 into our formula, we get:
(21 + 228)/2 = 124.5
Thus, the number halfway between 21 and 228 is 124.5.
To check that our answer is correct, we subtract 21 from 124.5 and subtract 124.5 from 228 and compare the two numbers:
124.5 - 21 = 103.5
228 - 124.5 = 103.5
As you can see, the halfway number is 103.5 higher than 21 and 103.5 lower than 228. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 21 and 229
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