The explanation and use of the collateral arithmetical table. Shewing by the help of a few additions only, the value, in sterling money, of any number of pieces of the current coin in England; and Also to pay any Sum of Money in any of the same Pieces. By Benjamin Webb, Writing Master and Accountant, and Master of the Free Grammar School, belonging to the Worshipful Company of Haberdashers, in Bunhill Row.