When you ask "What number is halfway between 85 and 428?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=85 and Y=428.
To find the number halfway between 85 and 428, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 428 into our formula, we get:
(85 + 428)/2 = 256.5
Thus, the number halfway between 85 and 428 is 256.5.
To check that our answer is correct, we subtract 85 from 256.5 and subtract 256.5 from 428 and compare the two numbers:
256.5 - 85 = 171.5
428 - 256.5 = 171.5
As you can see, the halfway number is 171.5 higher than 85 and 171.5 lower than 428. Therefore, our halfway between answer of 256.5 above is correct.
Halfway Between
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Halfway Between 85 and 429
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