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# Topic 9 Year 9 Mathematics

 Mathematics Topic Ratio review No of lessons 4 When is it happening Term 2 What will students learn Understand ratios describe proportional relationships. Be able to describe proportional relationships using ratios and fractions. Experience using scale factors, constants of proportionality and unit ratios to solve problems. Key Knowledge that students should know at the end of 'Topic' This is the knowledge that students will meet for the first time in this topic Students are reminded that ratios tell us about how things relate to each other, not the size of those things. Tables are used to compare part : part and part : whole ratios and to solve problems. Fractional representations of proportional relationships are connected to ratios. Students are challenged to find part : part and part : whole relationships as fractions. Constants of proportionality and scale factors are  revisited with a tabular representation of ratios. Bar models demonstrate the equivalence of equivalent ratios. Students use the unit ratio to find the constant of proportionality. They use the unit ratio to solve multi-step ratio problems. This is knowledge that students may have met before but will need to deepen their understanding Students are reminded that ratios tell us about how things relate to each other, not the size of those things. Tables are used to compare part : part and part : whole ratios and to solve problems. Key Skills that students should be able to demonstrate at the end of 'Topic' This is the skills  that students will meet for the first time in this topic Comparing ratios This is skills that students may have met before but will need to develop Finding a ratio as a fraction Key vocabulary that students should know and understand The Big Question Can you describe proportional relationships using ratios and fractions? Key questions that students should be able to answer at the end of the 'Topic' can you identify the difference between part : part and part : whole ratios? Can you write and interpret part-to-part and part-to-whole fractional proportional relationships from a ratio Can you identify and find equivalent ratios? Can you write ratios in the form 1 :n?