When you ask "What number is halfway between 79 and 991?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=79 and Y=991.
To find the number halfway between 79 and 991, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 991 into our formula, we get:
(79 + 991)/2 = 535
Thus, the number halfway between 79 and 991 is 535.
To check that our answer is correct, we subtract 79 from 535 and subtract 535 from 991 and compare the two numbers:
535 - 79 = 456
991 - 535 = 456
As you can see, the halfway number is 456 higher than 79 and 456 lower than 991. Therefore, our halfway between answer of 535 above is correct.
Halfway Between
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Halfway Between 79 and 992
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