# calculating heights: accumulating some heights for calculating in total the total hts

##### Full Member
once you wrote 20+20+20+20=80 I visualized it as
-------------------- + ------------------- +---------------------+---------------------=
-------------------------------------------------------------------------------------------

which every piece is 20 ...but what's confused me that the "+" between every piece may have also a space other than the size of the piece itself .. so it makes me confused!

#### Otis

##### Senior Member
once you wrote 20+20+20+20=80 I visualized it as

-------------------- + ------------------- + --------------------- + --------------------- =
-------------------------------------------------------------------------------------------

which every piece is 20 ...but what's confused me that the "+" between every piece may have also a space other than the size of the piece itself .. so it makes me confused!
In my example exercise (using shipping-container height), I gave ideal heights only (nice, Whole numbers). The shipping containers are imaginary, you're not given information about or asked to consider space between containers. Don't create variations to the given exercise. Use the numbers as given and add them. Done!

There's no "space" between exact numbers comprising a sum, either. Stop thinking about numbers that way. You're going to drive yourself insane. :shock:

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