When you ask "What number is halfway between 7 and 778?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=778.
To find the number halfway between 7 and 778, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 778 into our formula, we get:
(7 + 778)/2 = 392.5
Thus, the number halfway between 7 and 778 is 392.5.
To check that our answer is correct, we subtract 7 from 392.5 and subtract 392.5 from 778 and compare the two numbers:
392.5 - 7 = 385.5
778 - 392.5 = 385.5
As you can see, the halfway number is 385.5 higher than 7 and 385.5 lower than 778. Therefore, our halfway between answer of 392.5 above is correct.
Halfway Between
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