When you ask "What number is halfway between 79 and 990?" 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=990.
To find the number halfway between 79 and 990, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 990 into our formula, we get:
(79 + 990)/2 = 534.5
Thus, the number halfway between 79 and 990 is 534.5.
To check that our answer is correct, we subtract 79 from 534.5 and subtract 534.5 from 990 and compare the two numbers:
534.5 - 79 = 455.5
990 - 534.5 = 455.5
As you can see, the halfway number is 455.5 higher than 79 and 455.5 lower than 990. Therefore, our halfway between answer of 534.5 above is correct.
Halfway Between
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Halfway Between 79 and 991
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