Arithmetick made easie, for the use and benefit of trades-men [electronic resource] : wherein the nature and use of fractions, both vulgar and decimal, are taught by a new and exact method : also the mensuration of solids and superficies / by J. Ayres ; to which is added A short and easie method, after which shop-keepers may state, post, and balance their books of accounts, by Charles Snell ; the whole perused, and many errors corrected by E. Hatton