When you ask "What number is halfway between 100 and 355?" 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=355.
To find the number halfway between 100 and 355, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 355 into our formula, we get:
(100 + 355)/2 = 227.5
Thus, the number halfway between 100 and 355 is 227.5.
To check that our answer is correct, we subtract 100 from 227.5 and subtract 227.5 from 355 and compare the two numbers:
227.5 - 100 = 127.5
355 - 227.5 = 127.5
As you can see, the halfway number is 127.5 higher than 100 and 127.5 lower than 355. Therefore, our halfway between answer of 227.5 above is correct.
Halfway Between
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Halfway Between 100 and 356
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