When you ask "What number is halfway between 85 and 542?" 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=542.
To find the number halfway between 85 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 542 into our formula, we get:
(85 + 542)/2 = 313.5
Thus, the number halfway between 85 and 542 is 313.5.
To check that our answer is correct, we subtract 85 from 313.5 and subtract 313.5 from 542 and compare the two numbers:
313.5 - 85 = 228.5
542 - 313.5 = 228.5
As you can see, the halfway number is 228.5 higher than 85 and 228.5 lower than 542. Therefore, our halfway between answer of 313.5 above is correct.
Halfway Between
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Halfway Between 85 and 543
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