When you ask "What number is halfway between 100 and 191?" 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=191.
To find the number halfway between 100 and 191, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 191 into our formula, we get:
(100 + 191)/2 = 145.5
Thus, the number halfway between 100 and 191 is 145.5.
To check that our answer is correct, we subtract 100 from 145.5 and subtract 145.5 from 191 and compare the two numbers:
145.5 - 100 = 45.5
191 - 145.5 = 45.5
As you can see, the halfway number is 45.5 higher than 100 and 45.5 lower than 191. Therefore, our halfway between answer of 145.5 above is correct.
Halfway Between
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Halfway Between 100 and 192
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