When you ask "What number is halfway between 7 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=7 and Y=128.
To find the number halfway between 7 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 128 into our formula, we get:
(7 + 128)/2 = 67.5
Thus, the number halfway between 7 and 128 is 67.5.
To check that our answer is correct, we subtract 7 from 67.5 and subtract 67.5 from 128 and compare the two numbers:
67.5 - 7 = 60.5
128 - 67.5 = 60.5
As you can see, the halfway number is 60.5 higher than 7 and 60.5 lower than 128. Therefore, our halfway between answer of 67.5 above is correct.
Halfway Between
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Halfway Between 7 and 129
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