When you ask "What number is halfway between 6 and 399?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=6 and Y=399.
To find the number halfway between 6 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 6 and 399 into our formula, we get:
(6 + 399)/2 = 202.5
Thus, the number halfway between 6 and 399 is 202.5.
To check that our answer is correct, we subtract 6 from 202.5 and subtract 202.5 from 399 and compare the two numbers:
202.5 - 6 = 196.5
399 - 202.5 = 196.5
As you can see, the halfway number is 196.5 higher than 6 and 196.5 lower than 399. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 6 and 400
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