This practical activity from the Royal Institution provides students with an understanding of the different ways in which proportion can be expressed. Through a mixture of explanation and practical work, students explore how it is possible to give an accurate quantitative description of colours. Students mix varying quantities of red and blue water to create a range of different shades of purple which are then described in terms of fractional and percentage composition. Through this activity students experience a functional use of ordering equivalent fractions. The resource includes guidance for teachers, an overview of the activities, a presentation and activity sheet.
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