When you ask "What number is halfway between 42 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=42 and Y=205.
To find the number halfway between 42 and 205, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 205 into our formula, we get:
(42 + 205)/2 = 123.5
Thus, the number halfway between 42 and 205 is 123.5.
To check that our answer is correct, we subtract 42 from 123.5 and subtract 123.5 from 205 and compare the two numbers:
123.5 - 42 = 81.5
205 - 123.5 = 81.5
As you can see, the halfway number is 81.5 higher than 42 and 81.5 lower than 205. Therefore, our halfway between answer of 123.5 above is correct.
Halfway Between
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Halfway Between 42 and 206
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