How do I calculate a check-digit in Excel?

[Guest]

My math skills are deficient.
I've tried to work with 4 different formulas provided for other check-digit
makers, but my source number is 8 digits, and while it's a simpler formula, I
can't figure it out based on the other formulas:
Step 1 - divide the 8-digit number by 7;
Step 2 - multiply the remainder by 7. (If the remainder is more than one
digit, use only the first digit;
Step 3, Round that answer up to the next whole number. This is the check
digit

Note: If the remainder is zero, it is a whole number. Do not round up.
Zero is the check-digit.

Any help ???
Thanks in advance ...

 

[JE McGimpsey]

If I understand you correctly:

=ROUNDUP(ROUND(MOD(A1/7,1),1)*7,0)

 

[David Biddulph]

.... or more likely
=ROUNDUP(ROUNDDOWN(MOD(A1/7,1),1)*7,0)

Examples are shown at
http://www.cbp.gov/linkhandler/cgov/import/cargo_control/in_bond_check.ctt/in_bond_check.docor http://www.ecustoms.com/vg/QPWP-resources-in_bond_check.cfm--David Biddulph"JE McGimpsey" <[email protected]> wrote in messageIf I understand you correctly:>> =ROUNDUP(ROUND(MOD(A1/7,1),1)*7,0)> In article <[email protected]>,> Dan <[email protected]> wrote:>>> My math skills are deficient.>> I've tried to work with 4 different formulas provided for othercheck-digit>> makers, but my source number is 8 digits, and while it's a simplerformula, I>> can't figure it out based on the other formulas:>> Step 1 - divide the 8-digit number by 7;>> Step 2 - multiply the remainder by 7. (If the remainder is more than one>> digit, use only the first digit;>> Step 3, Round that answer up to the next whole number. This is the check>> digit>>>> Note: If the remainder is zero, it is a whole number. Do not round up.>> Zero is the check-digit.>>>> Any help ???>> Thanks in advance ...

 

[Guest]

Thanks very much David.
Interesting that the exact link to the Customs in-bond entry check-digit
calculator was the source of my question. I' glad you recognized the
question.
Best regards

.... or more likely
=ROUNDUP(ROUNDDOWN(MOD(A1/7,1),1)*7,0)

Examples are shown at
http://www.cbp.gov/linkhandler/cgov/import/cargo_control/in_bond_check.ctt/in_bond_check.docor http://www.ecustoms.com/vg/QPWP-resources-in_bond_check.cfm--David Biddulph"JE McGimpsey" <[email protected]> wrote in messagenews:[email protected]...> If I understand you correctly:>> =ROUNDUP(ROUND(MOD(A1/7,1),1)*7,0)> In article <[email protected]>,> Dan <[email protected]> wrote:>>> My math skills are deficient.>> I've tried to work with 4 different formulas provided for othercheck-digit>> makers, but my source number is 8 digits, and while it's a simplerformula, I>> can't figure it out based on the other formulas:>> Step 1 - divide the 8-digit number by 7;>> Step 2 - multiply the remainder by 7. (If the remainder is more than one>> digit, use only the first digit;>> Step 3, Round that answer up to the next whole number. This is the check>> digit>>>> Note: If the remainder is zero, it is a

whole number. Do not round up.>> Zero is the check-digit.>>>> Any help ???>> Thanks in advance ...

 

[David Biddulph]

It's always wise to quote the reference if you have a specific question,
Dan. The words you quoted didn't make sense without the extra data on the
page. Among other things, it's a strange definition of "remainder".
"Remainder" would normally be MOD(A1,7), not MOD(A1/7,1). Additional
confusion is caused when it says "if the remainder is more than one digit",
as any non-zero remainder with their definition is bound to be more than one
digit.

 

[Guest]

Thanks again. I'll take your advice and use the source document to ask the
question next time. I've gone to message/info boards a few times previously,
but never gotten an accurate response so quickly.