A great practice worksheet for missing addends and adding 3 addends--a two for one! The students plug in the missing number in each number sentence. There are 3 sheets included for the different levels of your students. The first sheet contains basic facts up to about 25.The 2nd gets into the 30's and 40's, and the 3rd sheet goes up to a sum of 60-70. Also, check out my Missing Addends Practice Worksheet!