When you ask "What number is halfway between 78 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=78 and Y=212.
To find the number halfway between 78 and 212, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 212 into our formula, we get:
(78 + 212)/2 = 145
Thus, the number halfway between 78 and 212 is 145.
To check that our answer is correct, we subtract 78 from 145 and subtract 145 from 212 and compare the two numbers:
145 - 78 = 67
212 - 145 = 67
As you can see, the halfway number is 67 higher than 78 and 67 lower than 212. Therefore, our halfway between answer of 145 above is correct.
Halfway Between
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Halfway Between 78 and 213
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