When you ask "What number is halfway between 17 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=17 and Y=128.
To find the number halfway between 17 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 128 into our formula, we get:
(17 + 128)/2 = 72.5
Thus, the number halfway between 17 and 128 is 72.5.
To check that our answer is correct, we subtract 17 from 72.5 and subtract 72.5 from 128 and compare the two numbers:
72.5 - 17 = 55.5
128 - 72.5 = 55.5
As you can see, the halfway number is 55.5 higher than 17 and 55.5 lower than 128. Therefore, our halfway between answer of 72.5 above is correct.
Halfway Between
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Halfway Between 17 and 129
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