Since1+3+2 = 6,3+2+6 =1,2+6+ 1 1= 19, it is 6+1

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Mathematical problems are generated by counting, calculating, measuring and observing the shape and motion of objects through abstract and logical reasoning. Mathematical problems can be roughly divided into fill-in-the-blank questions, true and false questions, multiple-choice questions, calculation questions, application questions, proof questions, drawing questions, thinking questions, reading questions, regular questions and problem solving. Skillful problem solving depends on the flexible use of the knowledge you usually study.

For example: 12+28=40, 5×20= 100, 12y+45y=57y,18y12y =/kloc-0. The purpose is to train pupils' minds and quick reaction ability through mental calculation, oral calculation, quick calculation and clever calculation. For example, it will also appear in the primary school math exam, and it often appears in the junior high school math test paper.