When you ask "What number is halfway between 78 and 613?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=613.
To find the number halfway between 78 and 613, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 613 into our formula, we get:
(78 + 613)/2 = 345.5
Thus, the number halfway between 78 and 613 is 345.5.
To check that our answer is correct, we subtract 78 from 345.5 and subtract 345.5 from 613 and compare the two numbers:
345.5 - 78 = 267.5
613 - 345.5 = 267.5
As you can see, the halfway number is 267.5 higher than 78 and 267.5 lower than 613. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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