I was given a partial adjusted trial for a company, if the supplies expense is the January 31 adjusting entry, and $510 of supplies was purchased in January, what was the balance in Supplies of January 1? What's on the Trial Balance is Supplies $818, Supplies Expense $923... So what I did was add the supplies $818+$510 supplies purchased = $1,328 then I subtracted that from $923. Which = $405. This is what I got for the balance in supplies on January 1, is this correct?