The slides are comprehensively linked to associated pedagogical guidance in the NCETM Primary Mastery Professional Development materials. There are also links to the ready-to-progress criteria detailed in the DfE Primary Mathematics Guidance 2020.

### Learning outcomes

1 | Pupils compare the structure of problems with one or two unknowns |

2 | Pupils compare the structure of problems with two unknowns |

3 | Pupils represent the structure of contextual problems with two unknowns |

4 | Pupils represent a problem with two unknowns using a bar model |

5 | Pupils explain why sometimes there is only one solution to a sum and difference problem |

6 | Pupils explain why sometimes there is only one solution to a sum and multiple problem |

7 | Pupils explain the values a part-whole model could represent |

8 | Pupils use a bar model to visualise how to solve a problem with two unknowns |

9 | Pupils use diagrams to explain how to solve a spatial problem |

10 | Pupils explain how to represent an equation with a bar model |

11 | Pupils solve problems with two unknowns in a range of contexts |

12 | Pupils systematically solve problems with two unknowns using ‘trial and improvement’ (one and several solutions) |

13 | Pupils explain how I know I have found all possible solutions to problems with two unknowns |

14 | Pupils explain how to balance an equation with two unknowns |

15 | Pupils systematically solve problems with two unknowns using ‘trial and improvement’ (one, several and infinite solutions) |