When you ask "What number is halfway between 21 and 205?" 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=205.
To find the number halfway between 21 and 205, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 205 into our formula, we get:
(21 + 205)/2 = 113
Thus, the number halfway between 21 and 205 is 113.
To check that our answer is correct, we subtract 21 from 113 and subtract 113 from 205 and compare the two numbers:
113 - 21 = 92
205 - 113 = 92
As you can see, the halfway number is 92 higher than 21 and 92 lower than 205. Therefore, our halfway between answer of 113 above is correct.
Halfway Between
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Halfway Between 21 and 206
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