Life of Fred -- Mineshaft
Description:
The intermediate books are not essential. When a student finishes Jelly Beans, they have all the arithmetic they need to start Fractions, but because of how quickly students can progress in the elementary books, a student might not be old enough to really be ready for Fractions (author recommends 5th grade). Kidneys, Liver and Mineshaft allow for more practice of arithmetic while the student gets older.
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