When you ask "What number is halfway between 4 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=4 and Y=128.
To find the number halfway between 4 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 128 into our formula, we get:
(4 + 128)/2 = 66
Thus, the number halfway between 4 and 128 is 66.
To check that our answer is correct, we subtract 4 from 66 and subtract 66 from 128 and compare the two numbers:
66 - 4 = 62
128 - 66 = 62
As you can see, the halfway number is 62 higher than 4 and 62 lower than 128. Therefore, our halfway between answer of 66 above is correct.
Halfway Between
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Halfway Between 4 and 129
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