When you ask "What number is halfway between 45 and 120?" 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=120.
To find the number halfway between 45 and 120, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 45 and 120 into our formula, we get:
(45 + 120)/2 = 82.5
Thus, the number halfway between 45 and 120 is 82.5.
To check that our answer is correct, we subtract 45 from 82.5 and subtract 82.5 from 120 and compare the two numbers:
82.5 - 45 = 37.5
120 - 82.5 = 37.5
As you can see, the halfway number is 37.5 higher than 45 and 37.5 lower than 120. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 45 and 121
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