This is a collection of our worksheets on finding the sum of 3 addends. It's a good activity to supplement your lesson on addition. You can use these math sheets as a review, quiz, pre test, assessment, homework, drill, or practice for your students in the 2nd, 3rd, or 4th grades. The activity type included in this packet are: Adding 3 Numbers, 2 Sums. (Add the first two numbers, then add its sum to the third number)*** View our ADDITION WORKSHEETS Bundle to save and get all types of worksheets.