When you ask "What number is halfway between 45 and 100?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=45 and Y=100.
To find the number halfway between 45 and 100, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 45 and 100 into our formula, we get:
(45 + 100)/2 = 72.5
Thus, the number halfway between 45 and 100 is 72.5.
To check that our answer is correct, we subtract 45 from 72.5 and subtract 72.5 from 100 and compare the two numbers:
72.5 - 45 = 27.5
100 - 72.5 = 27.5
As you can see, the halfway number is 27.5 higher than 45 and 27.5 lower than 100. Therefore, our halfway between answer of 72.5 above is correct.
Halfway Between
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Halfway Between 45 and 101
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