This resource  has been created by Jayne Webster and contains questions designed by Craig Barton using Variation.  The questions have been modelled using Cuisenaire rods to look at the structure of the problems and encourage pupils to convert between ratio and fractions.  These skills have then been applied to GCSE questions.  The final few slides address the confusion about the use of the word ratio in trigonometry and circles by introducing the ratio value.

Ratio

Comparison model

Ratio and fractions

Comparing ratios

Ratio to equations

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