One More, One Less - Sumdog

1 One More, One LessLesson plan = 60 min activityThis has been developed for use on Sumdog ( ), a new website offering high-quality, free mathematics games for Introduce basic addition by adding and subtracting one (count on, count back)Structure 60 min lesson Offline classroom activity followed by an online reviewResources Access to the Sumdog website Student handout from our website ( ) Optional: Interactive whiteboard or projectorPlan Preparation (optional): Sign up for an account on Sumdog and create accounts for your students. Activity (60 min): Review more and less (10 min) As a class, count up to 10. Write a number line as you count. Point to numbers randomly and then ask the class to tell you what one more/ less than this number is.

2 Add/subtract one (15 min) Show how one more/ less can also be written as addition or subtraction Write some problems on the board. Have the class express each problem using one more/ less , and then use the number line to find the correct answers. Play Sumdog games (25 minutes) Either print out and distribute the handouts, or project it in front of the class. Play the games together as a class (Street Racer or Canal Clear Up would be a good choice as the questions aren't timed). Paired review (10 min) Have each student think up a problem like the ones they have seen today (either add/subtract one or one more/ less ). Their partner must tell them the correct answer. They continue, taking Resources Get additional resources to help you with this lesson at: Sumdog s free mathematics games at 2010 Crocodile Clips LtdClassroom resources