This Fluency Activity is a part of the Lesson 28, Unit 4, Grade 1. This activity assesses students' progress toward mastery of the required addition fluency for first graders. Students who completed all questions correctly on their most recent Practice Set should be given the next level of difficulty. All other students should try to improve their scores on their current levels. 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 or subtraction on the back of their papers.