When you ask "What number is halfway between 42 and 287?" 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=287.
To find the number halfway between 42 and 287, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 287 into our formula, we get:
(42 + 287)/2 = 164.5
Thus, the number halfway between 42 and 287 is 164.5.
To check that our answer is correct, we subtract 42 from 164.5 and subtract 164.5 from 287 and compare the two numbers:
164.5 - 42 = 122.5
287 - 164.5 = 122.5
As you can see, the halfway number is 122.5 higher than 42 and 122.5 lower than 287. Therefore, our halfway between answer of 164.5 above is correct.
Halfway Between
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Halfway Between 42 and 288
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