Several books in this series can be found in the Top 25 Homeschool Sellers for 2006 list.
Explode The Code Book 1 1/2 reinforces and extends the sounds of short vowels learned in Explode The Code Book 1. The exercises begin with short a and then follow with short i, short u, short e, and short o. Students practice blending sounds to read and write consonant/vowel/consonant words. In addition, several review lessons are included.
