Readers 1x-10x are 10 new stories, set at the beginner level (as 1-10).  These were requested by teachers to provide children with more practice on simple sounding words before moving on to the next level (11-20) with its many digraphs.

Without introducing any new spelling principles, the Readers 1x-10x provide more long words which can be simply sounded out.

The printer’s a (a rather than a) is introduced in story 4x.

There are hardly any new special words in the 1x-10x series.  The basic principles of sounding out are consolidated with more sounding words and longer sounding words.