40 Must-Know Problem Sums with formula

This set includes volumes 1 through 6 of the 40 Must-Know Problem Sums for PSLE Students series. Each book covers problem sums for PSLE students. This collection is great for students preparing for the PSLE. If you buy, your child with lern many math strategies from this book Singapore based math. New books Never been used Bought in $230 SGD Selling in $25