The Primary Mathematics Standards Edition is a series of elementary math textbooks and workbooks from the publishers of Singapore's successful Primary Mathematics series. Newly adapted to align with the Mathematics Framework for California Public Schools, the program aims to equip students with sound concept development, critical thinking and efficient problemsolving skills.
The Workbooks correlate directly to the Textbooks so that learners consolidate new mathematical concepts with focused practice.
Features of the workbooks:

Each chapter in the Textbook has corresponding exercises in the Workbook which serve as an extension of the learning in the Textbook.

Math at Home activities (for Grades 1 and 2) in tearout sheets provide opportunities for meaningful family involvement in the students' learning process.

Review exercises at the end of each unit facilitate evaluation and consolidation of concepts covered in the preceding units.
Components of the Primary Mathematics Standards Edition series:
The Above extract from Preface of Primary Mathematics Standards Edition Workbook (reproduced with the permission of the publishers)
These workbooks are consumable and should be used in conjunction with the Primary Mathematics Standards Edition textbooks. They contain the exercises the student does independently.
The Primary Mathematics Standards Edition textbooks and workbooks DO NOT contain answer keys. Answers are in the home instructor's guide (now available for some levels) and the teacher's guide (available for all levels).
.