Resolve errorin formula when nesting issue

Sample:
Row Column A Column B
1 1125 1625 =SUM(B1-A1/A1 = .4444
2 430 430 =SUM(B2-A2/A2 = .0000
3 0 0 =SUM(B3-A3/A3 = #DIV/0'

When copying down first line, the error message appears when blank or zero cells are accessed. What can i do to remedy this problem. Their will always be "0" cells.

First time combining subtraction with division formulas.

Formula:

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Formula:

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Formula:

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Thanks but still need help. Feel totally stupid

For formula =SUM(B1-A1/A1 = .4444 - What am I doing wrong. Sorry, this is a learning process for me. =SUM(B1-A1)/A1,IFERROR(SUM(B1-A1/A1),0)

=SUM(B1-A1/A1)

should become

=IFERROR(SUM(B1-A1/A1,0)


This just says if the formula creates an error, do something else.


PS- make the rain go away