When you ask "What number is halfway between 45 and 212?" 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=212.
To find the number halfway between 45 and 212, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 45 and 212 into our formula, we get:
(45 + 212)/2 = 128.5
Thus, the number halfway between 45 and 212 is 128.5.
To check that our answer is correct, we subtract 45 from 128.5 and subtract 128.5 from 212 and compare the two numbers:
128.5 - 45 = 83.5
212 - 128.5 = 83.5
As you can see, the halfway number is 83.5 higher than 45 and 83.5 lower than 212. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 45 and 213
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