An introduction to arithmetic : containing arithmetical tables; with the most useful rules in common arithmetic. Vulgar and decimal fractions.---Extraction of the square and of the cube root. Rules for working on the carpenters sliding rule, and on Gunters scale.---Duodecimals, or cross multiplication.--Practical questions in mensuration. The Gregorian calendar; with a perpetual almanac.---A table for finding on what day of the week, any month begins; also a table for planting. A few forms of bills and promissory notes; with a small collection of miscellaneous questions. By James Gray, author of The concise spelling book for the use of children.