When you ask "What number is halfway between 47 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=47 and Y=128.
To find the number halfway between 47 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 47 and 128 into our formula, we get:
(47 + 128)/2 = 87.5
Thus, the number halfway between 47 and 128 is 87.5.
To check that our answer is correct, we subtract 47 from 87.5 and subtract 87.5 from 128 and compare the two numbers:
87.5 - 47 = 40.5
128 - 87.5 = 40.5
As you can see, the halfway number is 40.5 higher than 47 and 40.5 lower than 128. Therefore, our halfway between answer of 87.5 above is correct.
Halfway Between
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Halfway Between 47 and 129
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