Addition By 1 Sharing is Caring This iWorksheet contains 12 randomized items of addition by 1 for you to practice with. In the last item, click or touch anywhere to activate the FINISH button. Sharing is Caring Related iWorksheets: Addition By 4 Addition By 5 Addition By 6 Addition By 7 Post navigation Previous PostPrevious Math Drill – Advanced Linear Equations with FractionsNext PostNext Addition By 2