When you ask "What number is halfway between 7 and 390?" 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=390.
To find the number halfway between 7 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 390 into our formula, we get:
(7 + 390)/2 = 198.5
Thus, the number halfway between 7 and 390 is 198.5.
To check that our answer is correct, we subtract 7 from 198.5 and subtract 198.5 from 390 and compare the two numbers:
198.5 - 7 = 191.5
390 - 198.5 = 191.5
As you can see, the halfway number is 191.5 higher than 7 and 191.5 lower than 390. Therefore, our halfway between answer of 198.5 above is correct.
Halfway Between
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Halfway Between 7 and 391
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