This Fluency Activity is a part of the Lesson 4, Unit 5, Grade 1. Give the appropriate Practice Set to each student. Students who are repeating a set should be motivated to try to improve their performance. Students complete as many problems as they can in 90 seconds. Assign a counting pattern and start number for early finishers, or tell them to practice make ten addition and subtraction on the back of their papers. When time runs out, collect and correct any Practice Sets that are completed.