When you ask "What number is halfway between 10 and 291?" 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=291.
To find the number halfway between 10 and 291, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 291 into our formula, we get:
(10 + 291)/2 = 150.5
Thus, the number halfway between 10 and 291 is 150.5.
To check that our answer is correct, we subtract 10 from 150.5 and subtract 150.5 from 291 and compare the two numbers:
150.5 - 10 = 140.5
291 - 150.5 = 140.5
As you can see, the halfway number is 140.5 higher than 10 and 140.5 lower than 291. Therefore, our halfway between answer of 150.5 above is correct.
Halfway Between
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Halfway Between 10 and 292
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