Complete PDF interactive worksheets online, with no printing! With this missing addend addition worksheet you can generate up to 30 horizontal addition problems per page that add up to 10, 100 or 1000. You can also select individual forms to use for the missing addend additions, including the decision over including 1 or 2 decimal or simply rchoose the randomly use both. The missing addends are automatically marked with blank space. Witht the various options created, missing addend additions can be learned to solve easily granting significant practise for your students.