When you ask "What number is halfway between 100 and 125?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=125.
To find the number halfway between 100 and 125, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 125 into our formula, we get:
(100 + 125)/2 = 112.5
Thus, the number halfway between 100 and 125 is 112.5.
To check that our answer is correct, we subtract 100 from 112.5 and subtract 112.5 from 125 and compare the two numbers:
112.5 - 100 = 12.5
125 - 112.5 = 12.5
As you can see, the halfway number is 12.5 higher than 100 and 12.5 lower than 125. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 100 and 126
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