When you ask "What number is halfway between 28 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=28 and Y=291.
To find the number halfway between 28 and 291, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 291 into our formula, we get:
(28 + 291)/2 = 159.5
Thus, the number halfway between 28 and 291 is 159.5.
To check that our answer is correct, we subtract 28 from 159.5 and subtract 159.5 from 291 and compare the two numbers:
159.5 - 28 = 131.5
291 - 159.5 = 131.5
As you can see, the halfway number is 131.5 higher than 28 and 131.5 lower than 291. Therefore, our halfway between answer of 159.5 above is correct.
Halfway Between
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Halfway Between 28 and 292
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