When you ask "What number is halfway between 42 and 307?" 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=307.
To find the number halfway between 42 and 307, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 307 into our formula, we get:
(42 + 307)/2 = 174.5
Thus, the number halfway between 42 and 307 is 174.5.
To check that our answer is correct, we subtract 42 from 174.5 and subtract 174.5 from 307 and compare the two numbers:
174.5 - 42 = 132.5
307 - 174.5 = 132.5
As you can see, the halfway number is 132.5 higher than 42 and 132.5 lower than 307. Therefore, our halfway between answer of 174.5 above is correct.
Halfway Between
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Halfway Between 42 and 308
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