An introduction for to lerne to recken with the pen : or with the counters accordynge to the trewe cast of algorysme, in hole nombers or in broken, newly corrected. And certayne notable and goodlye rules of false posytions thereunto added, not before sene in oure Englyshe tonge by the whiche all maner of difficyle questyons may easily be dissolued and assoylyd. Anno. dni 1539.