How did the teacher support the students that were struggling? How did the teacher encourage the sharing of approaches and strategies? What do you think these students were learning? It is easy to find the boundaries at which someone becomes underweight/overweight/obese if one variable is held constant while the other is varied systematically. The boundaries occur at: BMI Underweight Below 18.5 Ideal weight 18.5 - 24.9 Overweight 25.0 - 29.9 Obesity 30.0 and Above In order to find out how the calculator works, it is better to forget realistic values for height and weight and simply hold one variable constant while changing the other systematically. For example, if students hold the height constant at 2 metres (not worrying if this is realistic!), then they will obtain the following table and/or graph: Weight (kg) 60 70 80 90 100 110 120 130 BMI 15 17.5 20 22.5 25 27.5 30 32.5 Underweight Ideal weight Overweight Obese From this it can be seen that there is a proportional relationship between weight and BMI. (If you double weight, you double BMI; Here BMI = Weight/4) Handout 8: Experimenting and controlling variables The BMI activity is taken from Swan, M; Pead, D (2008). Professional development resources. Bowland Maths Key Stage 3, Bowland Trust/ Department for Children, Schools and Families. Available online in the UK at: . It is used here by permission of the Bowland Trust. I: Time needed: 15 minutes discussion before the lesson 1 hour for the lesson 15 minutes after the lesson Choose one of the problems in this unit that you feel would be appropriate for your class. Discuss how you will: Organise the classroom and the resources needed. Introduce the problem to students. Explain to students how you want them to work together. Challenge/assist students that find the problem straightforward/ difficult. Help them share and learn from alternative problem-solving strategies. Conclude the lesson.
How did the teacher support the students that were struggling? How did the teacher encourage the sharing of approaches and strategies? What do you think these students were learning? It is easy to find the boundaries at which someone becomes underweight/overweight/obese if one variable is held constant while the other is varied systematically. The boundaries occur at: BMI Underweight Below 18.5 Ideal weight 18.5 - 24.9 Overweight 25.0 - 29.9 Obesity 30.0 and Above In order to find out how the calculator works, it is better to forget realistic values for height and weight and simply hold one variable constant while changing the other systematically. For example, if students hold the height constant at 2 metres (not worrying if this is realistic!), then they will obtain the following table and/or graph: Weight (kg) 60 70 80 90 100 110 120 130 BMI 15 17.5 20 22.5 25 27.5 30 32.5 Underweight Ideal weight Overweight Obese From this it can be seen that there is a proportional relationship between weight and BMI. (If you double weight, you double BMI; Here BMI = Weight/4) Handout 8: Experimenting and controlling variables The BMI activity is taken from Swan, M; Pead, D (2008). Professional development resources. Bowland Maths Key Stage 3, Bowland Trust/ Department for Children, Schools and Families. Available online in the UK at: . It is used here by permission of the Bowland Trust. I: Time needed: 15 minutes discussion before the lesson 1 hour for the lesson 15 minutes after the lesson Choose one of the problems in this unit that you feel would be appropriate for your class. Discuss how you will: Organise the classroom and the resources needed. Introduce the problem to students. Explain to students how you want them to work together. Challenge/assist students that find the problem straightforward/ difficult. Help them share and learn from alternative problem-solving strategies. Conclude the lesson.
primas_pd_3_guide.docx