Schoolmaster's Assistant, Being a Compendium of Arithmetic, Both Practical and Theoretical. in Five Parts... . to Which Is Prefixed, an Essay on the Education of Youth; ... a New Edition. by Thomas Dilworth,Thomas DilworthSchoolmaster's Assistant, Being a Compendium of Arithmetic, Both Practical and Theoretical. in Five Parts... . to Which Is Prefixed, an Essay on the Education of Youth; ... a New Edition. by Thomas Dilworth,Thomas Dilworth