Bar Model Approach to PSLE-2019 Questions
Ho Soo Thong Ho Shuyuan
In 2019 PSLE Examination, pupils encountered quite a number of challenging math questions. Here, we intend to highlight the basic mathematics in the Holistic Bar Modelling Approach to three questions.
A holistic bar model enables us to have an overview of the solution and see the challenging level of the question.
Remark : The question involves three related “Fraction”situations. There is a complex algebraic relation 3X = 7Y for which we apply the Greatest Common Unit Procedure.
Alternatively, we can use the Euclid’s Line-Segment Approach together with an algebraic symbol U as shown below.
Remark : A challenging Distributive Problem involves the algebraic relation
Cost = number of units × unit cost.
The solution apply Distributive Law for deductive approach.
Remark : The question is quite challenging to pupils. It involves a sequence of numbers and Algebra for a Sum-difference situation.