When you ask "What number is halfway between 10 and 557?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=557.
To find the number halfway between 10 and 557, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 557 into our formula, we get:
(10 + 557)/2 = 283.5
Thus, the number halfway between 10 and 557 is 283.5.
To check that our answer is correct, we subtract 10 from 283.5 and subtract 283.5 from 557 and compare the two numbers:
283.5 - 10 = 273.5
557 - 283.5 = 273.5
As you can see, the halfway number is 273.5 higher than 10 and 273.5 lower than 557. Therefore, our halfway between answer of 283.5 above is correct.
Halfway Between
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