When you ask "What number is halfway between 10 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=10 and Y=191.
To find the number halfway between 10 and 191, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 191 into our formula, we get:
(10 + 191)/2 = 100.5
Thus, the number halfway between 10 and 191 is 100.5.
To check that our answer is correct, we subtract 10 from 100.5 and subtract 100.5 from 191 and compare the two numbers:
100.5 - 10 = 90.5
191 - 100.5 = 90.5
As you can see, the halfway number is 90.5 higher than 10 and 90.5 lower than 191. Therefore, our halfway between answer of 100.5 above is correct.
Halfway Between
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Halfway Between 10 and 192
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