This Fluency Activity is a part of the Lesson 8, Unit 4, Grade 1. This subtraction review sheet contains the majority of subtraction facts within 10 (excluding some -0 and -1 facts), which are part of the required core fluency for Grade 1. Consider using this sheet to monitor progress toward mastery. Students complete as many problems as they can in three minutes. Choose a counting sequence for early finishers to practice on the back of their papers. When time runs out, read the answers aloud so students can correct their work.