When you ask "What number is halfway between 79 and 678?" 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=678.
To find the number halfway between 79 and 678, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 678 into our formula, we get:
(79 + 678)/2 = 378.5
Thus, the number halfway between 79 and 678 is 378.5.
To check that our answer is correct, we subtract 79 from 378.5 and subtract 378.5 from 678 and compare the two numbers:
378.5 - 79 = 299.5
678 - 378.5 = 299.5
As you can see, the halfway number is 299.5 higher than 79 and 299.5 lower than 678. Therefore, our halfway between answer of 378.5 above is correct.
Halfway Between
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Halfway Between 79 and 679
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