
When you ask "What number is halfway between 42 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=42 and Y=212.

To find the number halfway between 42 and 212, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 212 into our formula, we get:
(42 + 212)/2 = 127
Thus, the number halfway between 42 and 212 is 127.
To check that our answer is correct, we subtract 42 from 127 and subtract 127 from 212 and compare the two numbers:
127 - 42 = 85
212 - 127 = 85
As you can see, the halfway number is 85 higher than 42 and 85 lower than 212. Therefore, our halfway between answer of 127 above is correct.
Halfway Between
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Halfway Between 42 and 213
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