When you ask "What number is halfway between 100 and 457?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=457.
To find the number halfway between 100 and 457, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 457 into our formula, we get:
(100 + 457)/2 = 278.5
Thus, the number halfway between 100 and 457 is 278.5.
To check that our answer is correct, we subtract 100 from 278.5 and subtract 278.5 from 457 and compare the two numbers:
278.5 - 100 = 178.5
457 - 278.5 = 178.5
As you can see, the halfway number is 178.5 higher than 100 and 178.5 lower than 457. Therefore, our halfway between answer of 278.5 above is correct.
Halfway Between
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Halfway Between 100 and 458
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