A key to The complete practical arithmetician : containing answers to all the questions in that work, with the solutions at full length, wherever there is the smallest appearance of labour or difficulty ... : to which is added, An appendix, containing, a synopsis of logarithmical arithmetic ... : tables of compound interest and annuities ... also, general and universal demonstrations of the principal rules in The complete practical arithmetician ...
Keith, Thomas, 1759-1824; Keith, Thomas, 1759-1824. Complete practical arithmetician; Keith, Thomas, 1759-1824. Appendix to The complete practical arithmetician. 1790