When you ask "What number is halfway between 40 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=40 and Y=205.
To find the number halfway between 40 and 205, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 205 into our formula, we get:
(40 + 205)/2 = 122.5
Thus, the number halfway between 40 and 205 is 122.5.
To check that our answer is correct, we subtract 40 from 122.5 and subtract 122.5 from 205 and compare the two numbers:
122.5 - 40 = 82.5
205 - 122.5 = 82.5
As you can see, the halfway number is 82.5 higher than 40 and 82.5 lower than 205. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 40 and 206
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