When you ask "What number is halfway between 100 and 313?" 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=313.
To find the number halfway between 100 and 313, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 313 into our formula, we get:
(100 + 313)/2 = 206.5
Thus, the number halfway between 100 and 313 is 206.5.
To check that our answer is correct, we subtract 100 from 206.5 and subtract 206.5 from 313 and compare the two numbers:
206.5 - 100 = 106.5
313 - 206.5 = 106.5
As you can see, the halfway number is 106.5 higher than 100 and 106.5 lower than 313. Therefore, our halfway between answer of 206.5 above is correct.
Halfway Between
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Halfway Between 100 and 314
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