Complete PDF interactive worksheets online, with no printing! This addition worksheet can generate up to 30 vertical 1, 2 or 3 digit addition problems with up to 4 addends. It is up to your personal choice to select the digits right of the decimal (up to 3 digits) additionally. Going from simple decimal addition problems to more digit decimal addition problems increase the confidence of students and help them work quicker and more effectively with more complicated tasks.