This worksheet introduces pupils to factorising quadratic expressions into double brackets by using product and sum grids.

Section A provides plenty of practice as students have eighteen quadratic expressions that they must factorise. Our design encourages students to write out which number they must sum too and which number is the product. The first few questions are scaffolded to further aid pupils. In this section, all terms are positive.

Negative terms are introduced in section B. Here there are a further twenty-one questions in the same format as section A. The coefficient of x squared remains one throughout however, learners will consider expressions with positive and negative constants and coefficients of x.