Complete PDF interactive worksheets online, with no printing! This worksheet can generate up to 30 horizontal addition problems for different place values per page. Each created addition problem group will consist of 3 addition tasks, (1) adding 2 single digit numbers, (2) adding a single digit and a double digit number as tens, and (3) adding 2 double digit numbers resulting the addition of tens. By selecting the numbers for each addend you can create more diverse worksheets.