This Fluency Activity is a part of the Lesson 24, Unit 4, Grade 1. This activity assesses students' progress toward mastery of the required addition fluency for first graders. Give Practice Set B to students who correctly answered all questions on Practice Set A in the previous lesson. All other students should try to improve their scores on Practice Set A. 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.