When you ask "What number is halfway between 7 and 842?" 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=842.
To find the number halfway between 7 and 842, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 842 into our formula, we get:
(7 + 842)/2 = 424.5
Thus, the number halfway between 7 and 842 is 424.5.
To check that our answer is correct, we subtract 7 from 424.5 and subtract 424.5 from 842 and compare the two numbers:
424.5 - 7 = 417.5
842 - 424.5 = 417.5
As you can see, the halfway number is 417.5 higher than 7 and 417.5 lower than 842. Therefore, our halfway between answer of 424.5 above is correct.
Halfway Between
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Halfway Between 7 and 843
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