I recently noticed that the fabulous resource, Teaching Primary School Mathematics: A Resource Book has been updated for a second edition. The preface states that the second edition has been updated to:
be in line with the latest 2007 syllabus…The major difference in the 2007 syllabus at the primary school level is the introduction of the use of hand-held calculators at the Primary 5 and 6 levels.
Going page by page through the book, the only difference is in one sentence on page 26 regarding the use of calculators for Primary 5 and 6 levels now being encouraged by the CPDD (Curriculum Planning and Development Division) as opposed to being encouraged by the author.
If you are teaching the Singapore Math curriculum at your school, you should have a copy of this book. Having reviewed them both, I can now advise you, it doesn’t matter which edition.