When you ask "What number is halfway between 31 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=31 and Y=988.
To find the number halfway between 31 and 988, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 988 into our formula, we get:
(31 + 988)/2 = 509.5
Thus, the number halfway between 31 and 988 is 509.5.
To check that our answer is correct, we subtract 31 from 509.5 and subtract 509.5 from 988 and compare the two numbers:
509.5 - 31 = 478.5
988 - 509.5 = 478.5
As you can see, the halfway number is 478.5 higher than 31 and 478.5 lower than 988. Therefore, our halfway between answer of 509.5 above is correct.
Halfway Between
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Halfway Between 31 and 989
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