When you ask "What number is halfway between 100 and 201?" 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=201.
To find the number halfway between 100 and 201, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 201 into our formula, we get:
(100 + 201)/2 = 150.5
Thus, the number halfway between 100 and 201 is 150.5.
To check that our answer is correct, we subtract 100 from 150.5 and subtract 150.5 from 201 and compare the two numbers:
150.5 - 100 = 50.5
201 - 150.5 = 50.5
As you can see, the halfway number is 50.5 higher than 100 and 50.5 lower than 201. Therefore, our halfway between answer of 150.5 above is correct.
Halfway Between
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Halfway Between 100 and 202
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