When you ask "What number is halfway between 70 and 511?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=70 and Y=511.
To find the number halfway between 70 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 511 into our formula, we get:
(70 + 511)/2 = 290.5
Thus, the number halfway between 70 and 511 is 290.5.
To check that our answer is correct, we subtract 70 from 290.5 and subtract 290.5 from 511 and compare the two numbers:
290.5 - 70 = 220.5
511 - 290.5 = 220.5
As you can see, the halfway number is 220.5 higher than 70 and 220.5 lower than 511. Therefore, our halfway between answer of 290.5 above is correct.
Halfway Between
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Halfway Between 70 and 512
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