Well it depends on your data. I'm an accountant and it is very normal for accountants spreadsheets to be full of 'check digits'. Checks and balances are well i

Well it depends on your data. I'm an accountant and it is very normal for accountants spreadsheets to be full of 'check digits'. Checks and balances are well ingrained into accounts! In its basic form you perform the same calculation on the totals as you did on the roots and subtract it from the result. The answer must be zero. I know it is harder on some kinds of data, but it can prevent a huge amount of every day errors.