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MATHEMATICS – STAGE 3 Number and Algebra – Addition and Subtraction 2 Race against the stopwatch Outcomes MA3-1 WM MA3-2 WM MA3-3 WM MA3-5 NA Describes and represents mathematical situations in a variety of ways using mathematical terminology and some conventions Selects and applies appropriate problem solving strategies, including technological applications, in undertaking investigations Gives a valid reason for supporting one possible solution over another Selects and applies appropriate strategies for addition and subtraction with counting numbers of any size Resources A flat surface that is 20 metres long Tape measure to measure the length required Class set of stopwatches 10 markers Worksheet Instructions Divide the class into pairs Use markers to indicate where the students will run to Students complete the ‘Estimated amount of time’ column of the worksheet. They estimate how long they think it will take them to complete the required activity for the required length E.g. how long they think it will take to run 20 metres. ‘Partner 1’ records ‘Partner 2’s results whilst ‘Partner 2’ is completing the activities As each student completes an activity, they need to record their time result they received on the worksheet Switch roles Students can complete the activities in any order When the students have completed all the activities, they work out the difference between the ‘Estimated amount of time’ to the ‘Actual time taken’ for each activity Students then complete addition problem for the ‘Total estimated amount of time’ as well as the ‘Total amount of actual time’ Students then subtract the two amounts. Extension Allow students to compare results with other students and work out the speed and time of completing the activity for 100 metres/1km Construct appropriate graphs MATHEMATICS – STAGE 3 Number and Algebra – Addition and Subtraction 2 Race against the stopwatch - Worksheet Activities Running Totals Estimated amount of time Actual time taken Difference between estimated and actual