Core Knowledge Foundation. Categories: Age 2-5 Years, Age 6-9 years, All FKB Books, Animals, Beginner English, Core Knowledge Foundation, Creative Commons, Early Reader, English Stories, Fable, Grade 1 to Grade 3, Open Educational Resources, Story Collections. Fables is a collection of folk tales and fables written for a grade 1 level.. 6th Grade Core Knowledge DRAFT. 2 days ago. by mrssmithapa. Skills available for New York sixth-grade science standards. IXL's sixth-grade skills will be aligned to the New York Learning Standards soon! Until then, you can view a complete list of sixth-grade standards below. Standards are in black and IXL science skills are in dark green. Hold your mouse over the name of a skill to view a sample question. "/>Core knowledge science 6th grade