When you ask "What number is halfway between 31 and 128?" 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=128.
To find the number halfway between 31 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 128 into our formula, we get:
(31 + 128)/2 = 79.5
Thus, the number halfway between 31 and 128 is 79.5.
To check that our answer is correct, we subtract 31 from 79.5 and subtract 79.5 from 128 and compare the two numbers:
79.5 - 31 = 48.5
128 - 79.5 = 48.5
As you can see, the halfway number is 48.5 higher than 31 and 48.5 lower than 128. Therefore, our halfway between answer of 79.5 above is correct.
Halfway Between
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Halfway Between 31 and 129
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