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A key to the appendix in White's Mental arithmetic
also, a key to White's Self instructor -
A practical system of mental arithmetic
to which also is subjoined, as an appendix thereto, a variety of contracted examples -
The mental accountant
Containing rules for performing the computations, which usually occur in business, without a pen. Intended Chiefly For the Higher Classes of Young Gentlemen at Boarding Schools and Academies; and for Young Merchants. By Thomas Whiting, Writing-Master and Teacher of Mathematics near Westminster-Bridge, Lamdeth: and Author of the London Gentleman's And School-Master's Assistant