When you ask "What number is halfway between 87 and 988?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=988.
To find the number halfway between 87 and 988, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 988 into our formula, we get:
(87 + 988)/2 = 537.5
Thus, the number halfway between 87 and 988 is 537.5.
To check that our answer is correct, we subtract 87 from 537.5 and subtract 537.5 from 988 and compare the two numbers:
537.5 - 87 = 450.5
988 - 537.5 = 450.5
As you can see, the halfway number is 450.5 higher than 87 and 450.5 lower than 988. Therefore, our halfway between answer of 537.5 above is correct.
Halfway Between
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Halfway Between 87 and 989
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