When you ask "What number is halfway between 100 and 531?" 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=531.
To find the number halfway between 100 and 531, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 531 into our formula, we get:
(100 + 531)/2 = 315.5
Thus, the number halfway between 100 and 531 is 315.5.
To check that our answer is correct, we subtract 100 from 315.5 and subtract 315.5 from 531 and compare the two numbers:
315.5 - 100 = 215.5
531 - 315.5 = 215.5
As you can see, the halfway number is 215.5 higher than 100 and 215.5 lower than 531. Therefore, our halfway between answer of 315.5 above is correct.
Halfway Between
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Halfway Between 100 and 532
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