Several books in this series can be found in the Top 25 Homeschool Sellers for 2006 list.
The exercises in Explode The Code Book 3 1/2 reinforce the sounds learned in Book 3. Exercises begin with long vowels with silent-e and progress to consonant and vowel digraphs. Students practice blending sounds to read and write one-syllable words that include digraphs and long vowel sounds. In addition, several review lessons are included.