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Making a difference: Flexible intervention in additive reasoning

‘Making a Difference: developing additive reasoning’ is a comprehensive training programme which explores in depth how to support understanding and address misconceptions within additive reasoning. It includes a set of flexible intervention materials, containing detailed activities, written to support children with developing conceptual understanding of addition and subtraction.

The materials can be used as part of immediate intervention sessions during teaching sequences in Y2 to Y5 or as an intervention programme working with pupils working below age-related  expectations.

  • understanding and using place value with two-digit and three-digit numbers
  • understanding and using the relationship between addition and subtraction with two-digit and three-digit numbers
  • applying understanding to add and subtract pairs of two-digit and three-digit numbers including developing an understanding of written methods


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