When you ask "What number is halfway between 100 and 211?" 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=211.
To find the number halfway between 100 and 211, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 211 into our formula, we get:
(100 + 211)/2 = 155.5
Thus, the number halfway between 100 and 211 is 155.5.
To check that our answer is correct, we subtract 100 from 155.5 and subtract 155.5 from 211 and compare the two numbers:
155.5 - 100 = 55.5
211 - 155.5 = 55.5
As you can see, the halfway number is 55.5 higher than 100 and 55.5 lower than 211. Therefore, our halfway between answer of 155.5 above is correct.
Halfway Between
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Halfway Between 100 and 212
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