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The Case For Maths Teaching Reform

It is very important that correct results be obtained and for this reason answers are given, but these are so hidden from the data in the problems that pupils can not well work for the answer. If pupils are unable to solve these problems after having go over the work in the ordinary written arithmetic, special drills are necessary on principles and a written analysis in the preparation of the lesson advisable. In the recitation a complete oral analysis should be given. Slow and thorough work is the only way to make good arithmeticians.
(Taken from: "The Williams & Rogers mental arithmetic, containing thorough oral drill in the principles of arithmetic", 1887)
https://archive.org/stream/williamsrogersm00cookgoog/williamsrogersm00cookgoog_djvu.txt