Consumable. Singapore Primary Math 6B Workbook should be used in conjunction with the Singapore Primary Math 6B Textbook . This workbook provides the practice essential to skill mastery and the included exercises should be done by the student independently. A variety of exercises are presented, from pictorial to abstra Sonlight resource: https://www.sonlight.com/products/singapore-primary-math-us-edition-6b-workbook-only