When you ask "What number is halfway between 28 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=28 and Y=128.
To find the number halfway between 28 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 128 into our formula, we get:
(28 + 128)/2 = 78
Thus, the number halfway between 28 and 128 is 78.
To check that our answer is correct, we subtract 28 from 78 and subtract 78 from 128 and compare the two numbers:
78 - 28 = 50
128 - 78 = 50
As you can see, the halfway number is 50 higher than 28 and 50 lower than 128. Therefore, our halfway between answer of 78 above is correct.
Halfway Between
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Halfway Between 28 and 129
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