Complete PDF interactive worksheets online, with no printing! Super and fun challenge for vertical addition problems as for these addition worksheets you can create up to 30 vertical addition problems with 5, 6 or even 7 digit numbers and up to 4 addends per worksheet. As extra possibility you can choose the "randomly selected digits" option to make sure each addition is unexpectedly unique and of different difficulty. By clicking on this option you make sure to include 5, 6 and also 7 digit numbers in the worksheet.