When you ask "What number is halfway between 42 and 87?" 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=87.
To find the number halfway between 42 and 87, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 87 into our formula, we get:
(42 + 87)/2 = 64.5
Thus, the number halfway between 42 and 87 is 64.5.
To check that our answer is correct, we subtract 42 from 64.5 and subtract 64.5 from 87 and compare the two numbers:
64.5 - 42 = 22.5
87 - 64.5 = 22.5
As you can see, the halfway number is 22.5 higher than 42 and 22.5 lower than 87. Therefore, our halfway between answer of 64.5 above is correct.
Halfway Between
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Halfway Between 42 and 88
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