Dear valued friend and supporter of onSponge, thank you for being our patron.
Owing to the COVID19 suspension of activities at the workplace mandated by MOH, onSponge will not be able to fulfill order deliveries between 7 April to 1 June 2020.
Orders made prior to this period have been dispatched by courier or allowed for collection at our pick up points.
Orders can be made during this period, but please note it will only be fulfilled from end June onwards.
Should you experience difficulties with your order(s) during this period, or for any other enquiry, please reach us at and we will respond to you.
Thank you and we look forward to resuming our service soon.

P4 Essential Problem Solving Skills (Latest Edition)


Solution / Answer Booklet

What type of solution booklet is required
  • This Essential Problem Solving Skills (EPSS) series is designed as an enhanced-learning resource for Primary 3 to 6 students.  Based on the MOE syllabus, EPSS adopts the scaffold approach to learning right from the concept stage in each opening chapter. 

    Key features in EPSS 

    • Opening Chapter - introduces basis of concepts covered in the chapter.
    • Let's Get Started - learn the fundamental understanding of the concepts in a scaffold approach through pre-exercises before it is being applied to a full word problem sum.
    • Let's Practise - reinforces understanding of each concepts with 4 to 6 problem sums which are carefully and developed at increasing levels of difficulty to better expose and prepare students in their learning.
    • Review Questions - test competency in application of concepts at the end of each main chapter through problem sums which have been randomly put together in a mixed-question format. 

    Book Title : P4 Essential Problem Solving Skills
    Page extent : 220 pages
    Publisher : onSponge Pte Ltd
    ISBN Number : 978-981-07-7540-7

    Solutions are available for download online at Alternatively, you can purchase the P4 Essential Problem Solving Skills WITH the printed answer booklet for $14.