When you ask "What number is halfway between 72 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=72 and Y=128.
To find the number halfway between 72 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 128 into our formula, we get:
(72 + 128)/2 = 100
Thus, the number halfway between 72 and 128 is 100.
To check that our answer is correct, we subtract 72 from 100 and subtract 100 from 128 and compare the two numbers:
100 - 72 = 28
128 - 100 = 28
As you can see, the halfway number is 28 higher than 72 and 28 lower than 128. Therefore, our halfway between answer of 100 above is correct.
Halfway Between
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Halfway Between 72 and 129
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